Isx blowing coolant out overflow but not overheating

75 posts · Joined 2003. #9 · Nov 11, 2005. ok try this, turn the heater on to full blast, wait 5 min. then there 2 lines going to the heater core an inlet and outlet near the firewall. Touch one, the inlet, it should be hot. The other should be hot too if the coolant is going through the heater core.

Inspect the gasket on the cap. It needs to form an air-tight seal, or else the unpressurized system will coolant to boil off at lower temperatures. As others have suggested, check for radiator kinks, fans, and if all else fails, replace the thermostat. Most importantly, CHECK THE WATER PUMP AREA FOR LEAKS.For inward coolant spills, you should take a gander at the head (chamber block), it could likewise be that you have a defective head gasket, as this will allow the coolant to leak out. 3. External Leak. The most effortless to pinpoint what the issue is would be on the off chance that it is an outer break. For the most part, in the event that ...359 posts · Joined 2005. #3 · Nov 25, 2005. yeah you have a leaky head gasket, right now it is just letting compression out of the motor into your coolant system. If you drive it for a few more days it will start to overheat. This is the one of two signs that you have a head gasket issue, the other is you are letting coolant into your oil ...1) Yes, the XLR does have an engine cooling fan. 2) Yes, the engine cooling fan can operate with the A/C off if the engine coolant, engine oil or transmission fluid temperatures are high enough. 3) Fan operating parameters are: Low -speed fan operation begins @ 204 degrees (engine coolant temp.) or A/C pressure of 160 psi.Dec 27, 2010. #6. All engines are designes to bypass the rad via the thermostat in cold temps. Basically your water pump circulates water through the block, tranny cooler, cab and bunk heat exchange units, until it reaches a certain temp, then the thermostat will open up and let coolant into the system from the rad, and will lower the temp at ...1. Coolant was spilled. If you refilled coolant in your radiator and happened to spill it around the radiator, that could be one of the causes for unexplained steam. This is because the radiator has now risen in temperature and, as a result, is causing the surrounding spilled coolant to evaporate.

Got a 16 plate 1.6 ASX when doing motorway speeds can loose a whole header tank after 60 miles, but lower speeds can vary amounts. No signs of leaks other than blowing coolant out overflow on header tank, changed header tank, changed thermostat, changed cam belt and water pump and done a test on head that was negative.If you find that you’ve got a car running hot but not overheating there might be a few reasons: Clogged or damaged radiator. Low coolant level. Damaged water pump or thermostat. Overworked engine. Assuming your cooling system is working properly meaning it’s full of clean coolant and doesn’t have any damaged or clogged …My Volvo has a new multichamber coolant overflow tank that transfers coolant onto the ground. On one side of the tank, the sensor tells me I'm low on coolant, so I fill it up to the line. Then, the truck runs warm for a few hours, and coolant flows back into the other side, eventually filling up that chamber until it drains out hose to the ground.Yes, a bad water pump can cause coolant to bubble. The water pump helps circulate coolant through the radiator tubes, where it cools. The cool coolant then spreads into the engine components through the engine’s pipes or passage. With the pump bad, there won’t be anything to circulate coolant to the radiator.The only problem is it is leaking coolant out of overflow tank hose. Seems to be pulling a little coolant out of radiator and into the overflow then out the overflow hose. ... And the radiator is about a quart low on coolant. Any ideas. Thanks so much for the help on the overheating problem. Reactions: dalscott. greasytshirt Moderator. Staff ...WHEN I IDLE AT 1000 AND ABOVE OR JUST DRIVE IT, THEN I NEVER HAVE A PROBLEM WITH OVERHEATING NOR LOOSING ANTIFREEZE. I HAVE REPLACED A WATER COOLER, A TOP TANK CAP, TOOK A THERMOSTAT OUT, FLUSHED A SYSTEM AND CHECKED A RADIATOR FOR LEEKS. ... I am working on …Engine coolant can leak externally through a hose, radiator, water pump, etc. or internally due to a leaking head gasket and sometimes a leaking intake manifold gasket depending on the engine design. External leaks are typically found by simple pressure testing of the cooling system.Cooling system held a vacuum at 17psi for 1 hour with no drop. Both fans kicking on and not running slow. Thermo is opening but as the engine heats up, pressure builds and the hoses bulge. Radiator and heater core flushed twice Steam pouring out of overflow hose from heads to overflow tank. Intermittent water spitting out but mostly steam.

Subject: Coolant overflow problem. I have a 02 Dakota Quad cab with a 4.7 V8. Normally the coolant heats up and is vented to the overflow, when it cools it is sucked back into the engine. Problem is it doesn't do that anymore. Keeps blowing coolant out of the engine and into the overflow till it is full and the engine starts to over heat.ford_doctor. I was thinking the CAC was leaking however you already replaced it. You might want to start looking at the secondary cooling system itself - I would suspect the system is overheating and if you removed the EGR cooler the ECT2 sensor is now gone unless your delete relocated it.Noticed a leak. We took the front end of the car off to see where the leak was. Only to find that it was only coming from the overflow Coolant tank. Checked the spark plugs, compression test, and then finally started lookin around the radiator cap. The one on the top of the pic, is the old radiator cap. Which has lost the middle.Blockages in an aquarium drain or a malfunctioning pump can lead to a floor covered in water. Thankfully, with a simple circuit, the right parts, and some spare time, you can build...

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Personally, once you pull it out, just replace it to be safe. Replace cap if not already done, check bottle for leaks as noted. Let it sit for 15-20 minutes and idle, watching for activity. The delta is getting high but with egr delete, hard to tell if you have plugged cooler without egr valve residue.Only logical next step is head gasket. Tester March 27, 2015, 8:57pm 4. When the engine is cold, remove the radiator cap/reservoir cap and start the engine. Watch the coolant as the engine idles. If bubbles appear in the coolant that’s an indication of breached head gasket. Tester. krisskross March 28, 2015, 12:20am 5.It is a reservoir. Not really an overflow. If your coolant is boiling into the reservoir then either your coolant was low to begin with, the cap is bad, or something more major like thermostat or head gasket. Fill reservoir. Open radiator. Fill radiator. Run bike with cap off until you see fluid flowing. Top off radiator and then close the cap.You have compression inside your coolant system. Usually a blow head-gasket, dropped cylinder liner, or cracked head (over-heated). In rare cases, the fault is in the turbo or the air compressor (but very rare). You will also have signs of oil/coolant cross-contamination. Look for oil in coolant and vise-versa.

It isn't a Polaris and you shouldn't have to worry about the temp much. Scratches down in low snow, let it cool if the temp light comes on. The caps can leak, you probably have that fixed by bending the tabs a little. Sometimes cap wear out and will not hold the 15 lbs of pressure in the system anymore and puke coolant."We've already seen around the edges some blowups in parts of the crypto world, and that could be foreshadowing some problems," Jeff Gundlach said. Jump to Billionaire investor Jef...Keeping your computer running within safe temperatures is important, especially as the temperature rises outside. Here's how to make sure your computer's not overheating—and how to...My coolant will shoot out overflow hose when under full throttle climbing hills and it shoots out alot of coolant. i did water bottle test and there are bubbles not alot but it was done at idle. I took air compressor air hose off and still getting bubbles compressor has just been changed recently.Coolant coming from overflow but engine not overheating. Posted by Anonymous on Sep 18, 2013. Want Answer 0. ... SOURCE: pajero diesel 2800 radiator coolant overflows, engine temp. up. REMOVE RAD CAP AND RUN ENGINE AT 3000RPM WITH ALL HEATERS ON SOUNDS LIKE AIR LOCK, ALSO CHECK IF HOSES ARE HOT.Engine coolant can leak externally through a hose, radiator, water pump, etc. or internally due to a leaking head gasket and sometimes a leaking intake manifold gasket depending on the engine design. External leaks are typically found by simple pressure testing of the cooling system.ImperialCrown. A coolant sample can be checked with a chemical CO2 detector. CO2 is a byproduct of combustion. If CO2 is found, it would likely be a head gasket combustion chamber-to-water jacket leak. If CO2 is not detected, it could be an air leak into the suction side of the water pump (lower radiator hose side).This type coolant leak is common on the new LML. The overflow tank has a divided inside. The side closest to the upper and lower hose holds the coolant. The other side (passenger side) is designed to catch overflow only. Most of the time the passenger side will and should be empty.Last week: Car blew a coolant line, replaced it, added coolant and it was fine for a few days and then all of a sudden the coolant was gone. It looked like it came out the overflow. The tank would no longer hold pressure. Replaced the tank, drove it and a different coolant line broke. Fixed that, now the overheating.Blowing coolant out overflow. 04 Duramax, by the vin i think its an lly. Been blowing out about a gallon of coolant a day for several thousand miles. Never overheats, never leaks except from the overflow tube. Replaced parts-- radiator, lower rad hose, all "top of motor"coolant hoses, GM thermostats. Nothing has helped, now that its winter …With a cold engine (let it sit overnight), start the engine with the radiator &/or coolant overflow cap removed. Let it idle and warm up. Keep an eye out on the level and circulation of coolant through the top of the radiator. Any trapped air should find it's way out of the system.

With a cold engine, remove the radiator cap and install a spill proof funnel in its location. Fill the funnel to 1/2 full with fresh coolant. Start the engine and let it warm up. As the engine reaches the setpoint of the thermostat, bubbles of air will come up through the coolant in the funnel; keep the funnel 1/2 full by adding more coolant as ...

2. Visible coolant leaks. Another symptom commonly associated with a bad or failing coolant recovery reservoir is leaking coolant. If the coolant recovery reservoir becomes damaged or develops any cracks, perhaps due to old age or boiling coolant, it will cause coolant leaks. Small leaks or cracks may produce steam, drips, and a faint coolant ...06' ISX Blowing Coolant out of Radiator overflow. I have a 2006 W900L. Does not run hot, but when driving down the road it looses coolant out of the overflow on the radiator. I can leave the truck setting idled up and looses no coolant.Noticed a leak. We took the front end of the car off to see where the leak was. Only to find that it was only coming from the overflow Coolant tank. Checked the spark plugs, compression test, and then finally started lookin around the radiator cap. The one on the top of the pic, is the old radiator cap. Which has lost the middle.5772 posts · Joined 2009. #17 · Jun 22, 2011. For those of you who have deleted your EGR cooler, coolant being blown out the reservoir is a good indication of a head gasket failure. For those of you who have NOT deleted their EGR cooler, you may have a blown cooler that is pressuring up your coolant system and blowing coolant out the ...Driving while overheating can cause long term engine damage. 2. White Smoke. If your Fusion's engine gets hot enough, the coolant will begin to boil over and manifest itself as steam coming up from under the hood. It does this to relieve the pressure on the cooling system before lasting damage can occur. 3.V6- coolant not siphoning back from coolant overflow (not overheating) djtc: 4th Gen T4Rs: 32: 08-27-2021 10:13 AM: Quick question about overflow reservoir: amalik: 3rd gen T4Rs: 8: 07-22-2016 12:51 PM: Left my 99 running and the coolant reservoir startes boiling: DeadbeatYota: 3rd gen T4Rs: 8: 06-04-2014 04:16 PM: Boiling coolant after long ...Everyone. Isx-15 mandated, def-egr 640k miles. About 7 months ago coolant started coming out my reservoir tank (pressure relief cap) got to the shop, it was tested …63 posts · Joined 2015. #3 · Nov 1, 2021. I had similar issues with my lml, though it was during regular driving. Overtime it started to overheat in an odd way and puke coolant out the reservoir. I recommend getting a exhaust gas coolant tester thingy, bou $20-30 from auto parts store or hf.

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This type coolant leak is common on the new LML. The overflow tank has a divided inside. The side closest to the upper and lower hose holds the coolant. The other side (passenger side) is designed to catch overflow only. Most of the time the passenger side will and should be empty.The coolant was being lost through the coolant overflow hose. I fought with this, stopping every 30-45 minutes and adding 1/4 to 1/2 gallon of water. The engine never did run hot, with the hottest it ever got being a hair over 200.This condition could be caused by a malfunctioning turbo, blockage in the air filter or housing, or possibly a restriction in the charge air cooler. Joe. mobile-tech. …2: If you can change a thermostat, you can remove the water pump. It's very easy. 3: If your coolant is overflowing after 30 literal seconds of the engine running, you may have a head gasket issue. The engine shouldn't get warm enough in 30 seconds to cause enough expansion for overflow.1998 Mack E7 460 blowing anti freeze out of overflow tank. Working on a 98 Mack that once it gets warmed up it pressurized the overflow tank and blows antifreeze out. The customer had it any Mack and they replaced the rear head and number 5 liner. The air compressor has been replaced along with the radiator cap.I just recently had some overheating issues on my 4wd Tacoma and, after replacing the thermostat, water pump and radiator cap, the truck drives fine WITH JUST TAP WATER IN THE COOLANT SYSTEM (which I will replace with real coolant after I'm done testing) but, when I check the coolant spillover tank right after driving, I see it mildly boiling ...Coolant pushing from. 2018 kenworth t680 isx Cummins. Coolant pushing from expansion tank to overflow tank. Things I've tried to fix it. New expansion/overflow tank, new caps, new egr, engine overhauled, no overheating problems, started at 200k, overhaul at 560k. Still having the problem.08 6.7 overheating. my 08 6.7 3500 is over heating, the truck runs at 225deg when towing which causes it to blow out of the overflow resivoir. I have replaced the Radiator,the coolant is a 50/50 mix, the radiator cap, and thermostat. have made sure all air has been purged from the cooling system. The truck will run @ 190-205deg for a day then ...This started out with the fan not kicking on at 210*, coolant temp got up to 225 on me, and for the rest of the trip I drove it gently to keep ECT down. I figured if it ended up being an issue I could pull over and unplug the solenoid on the front cover and force the fan on all the time.Add more using the spill free funnel and make sure all the air is removed. Thermostats fail in the closed position, so that would prevent coolant from moving through the radiator and causing overheating. You can be low on coolant and still have heat. The reservoir only holds about a quart, the cooling system in total holds about nine quarts.Hey guys, I have a 2011 Mack CXU613 with a 455 hp MP8 motor. The truck started pushing coolant out of the reservoir tank when climbing up mountains and long hills. The problem seems to be getting worse. I did replace the coolant tank with one of Ebay some time ago, and its maybe possible that I h...CowboyRam Discussion starter. 1267 posts · Joined 2015. #1 · May 5, 2017. We have been trying to figure out why our MF 1135 is blowing off antifreeze. At first we thought that we had a bad hose, so we replaced the top hoses. Then we took out the radiator and had it checked; it is fine. It seems to blow off during a hard pull. ….

Cause 1. Engine Overheating. When the engine overheats, the pressure in the cooling system increases, causing the coolant to expand and possibly overflow from the reservoir. Overheating can be caused by a variety of issues, such as a clogged radiator, a faulty thermostat, or a damaged water pump.A leaking overflow hose will run your coolant down fairly fast and you should see an anti-freeze trail where it leaks. Changing that is easy and not expensive as well. Do both then sleep well. :smile: 1995 Camry Wagon LE. 2.2 5S-FE, Auto, 261K. C.7 posts · Joined 2013. #1 · Jan 22, 2013. Coolant is being pushed out of my reservoir through my overflow tube. I have replaced the cap, thermostats, waterpump, and ECT sensor. My temp fluctuates mostly staying cold then gradually getting warmer but then drops cold again. It takes forever to get it warmed up where it'll allow heat through the ...I have a 95 f250 with a 460. I had coolant come out of the overflow bottle after sitting for a couple minutes. Has only happened one time but dont want to chance harming the engine. New water pump and thermostat 700 miles ago. Truck doesnt overheat. Drained oil to check for coolant, no coolant in oil.Jun 2, 2018 · Temps outside going down 85 to 90, lost just over a gallon of fluid then. Temps coming home, around 70 and raining, short of a gallon used to top off. Both times, had display up, max temp showing in display, about 205, most of the time around 190. Chris . Sandpiper 379 FLOK, Volvo 2012 730. This will likely stop or hinder coolant flowing or circulating through the engine. Another common cause is there is some sort of blockage in the radiator. These can be external or internal faults causing blockages. External issues with radiators are generally the result of too much dirt or similar not allowing airflow around the radiator.Note: The table above provides a concise overview of the various causes of coolant tank overflow. Understanding the Coolant Overflow Tank. The coolant overflow tank, also known as the coolant reservoir or coolant expansion tank, is an essential component of a vehicle's cooling system.It plays a crucial role in maintaining the proper functioning of the engine by regulating the coolant level ...Overflow of coolant from the overflow tube or hose is not normal and should be treated with utmost seriousness. Coolant overflow can be caused by many factors, including overheating problems, damaged radiator caps, overfilled antifreeze, faulty radiator and water pump issues. Below are some common reasons your coolant may come out of the ... Isx blowing coolant out overflow but not overheating, When towing a decent load (37' 5th wheel toy hauler) with in a hour, the low coolant light comes on. It is being blown out of the tube on the overflow tank. I have to be super careful taking the cap off, because there is so much pressure building up that it will blow the cap out of the air and shoot a geyser of coolant 15' in the air., Last week it started overheating. To date I've replaced the thermostat, water pump, coolant reservoir tank cap and serpentine belt. It's still losing coolant from the reservoir. It doesn't have coolant in the oil, so I'm thinking the head gasket is still good, but don't know what else to check. There's no bleeder port for the coolant., 91 posts · Joined 2007. #2 · Apr 3, 2013. A thermostat stuck wide open or not in the system at all can cause overheating, as coolant flows too quickly thru the radiator to cool. A radiator cap that has lost spring tension can allow coolant to escape to the overflow and lost, cheapest and easiest to try. Also, the cooling system needs to be ..., We currently have the old 8640 in the shop and are trying to figure out why there is coolant pushing out of the overflow line. The tractor is our secondary tractor and has just rolled over 10,000 hours of which I have owned for less than 1000 hrs and do not know any history before that. The first symptoms of an issue were that there was no heat ..., 2012 isx blowing coolant out the overflow Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by lciambotti1, Jun 25, 2019. Jun 25, 2019 #1 ... my coolant usage went from a gallon every 3K miles to 3 gallons in 2100 miles to 2 gallons in 200 miles and my driver just called and said he lost 4 gallons in 59 miles. Bought the kit from ..., The water pump is pushing water around and it's also heating up/expanding. Coolant reservoir being empty isn't terribly surprising or a key indicator by itself. Burp it properly and drive it and let us know if you get any overheating, bubbles in the overflow tank while idling, after driving, etc. It's not the water pump., Apr 29, 2011 · subiesailor. 22689 posts · Joined 2008. #9 · May 12, 2011. It may need to idle for 10 minutes or so and once you see that there are no more bubbles surfacing you can shut the car off. Top off the coolant in the radiator - put the cap back on. Then check the level in your over flow bottle and top up if needed. , If you have a cooling system pressure tester you can test the cap, if not they are a maintenance item and fairly cheap, let the coolant get down a little to leave room for expansion. then see how it does. Of coarse if this isnt the problem, then we are looking combustion in the cooling system pushing the coolant out, in this situation, if you ..., Right above where your headers connect. It's greenish in color. Remove radiator cap first. Crack that screw or remove it and don't lose the tiny washer behind it. If there is air you should hear it hiss when loosened. Let some coolant come out and tighten it back up. Manual states a little different when doing it but that should tell you if ..., ISX 15 Puking Coolant From Reservoir Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by lawtransport, Dec 24, 2017. Page 1 ... and when I open the hood the upper radiator hose is pulsating and the coolant appears to be boiling causing it to come out of my overflow hose on the coolant reservoir, I have had the reservoir, …, The water pump is the heart of your BMW's cooling system, circulating the coolant through the engine and radiator. A worn water pump can develop leaks in two ways: 1. Leaking shaft seal - The water pump's metal impeller shaft passes through a rubber seal. Over time, this seal dries out and leaks coolant from the pump housing. 2., 5. The Turbocharger. If your coolant level is low, with no obvious leak, and your car has a turbocharger, there might be a failure in the seal between the compressor and the engine. The coolant escapes the seal and finds its way into the combustion chamber, leaving you with a mysteriously low coolant level in the reservoir., 1. Coolant was flowing out from reservoir. 2. Coolant not topped off in radiator. 3. Steam or white smoke from tailpipe. I topped off coolant after engine cooled down and removed air bubbles. I proceeded to drivea nd after a while, the temp went upagain. So, I turned on the heater and temp went down while driving., How much does Party City charge to blow up balloons? We have information on availability and pricing. Does Party City fill balloons? How much does Party City charge to fill balloon..., I removed the head and checked the gasket. Gasket is good. The head bolts were loose to start with. Re-torqued the head and fixed that problem. Filled the radiator and ran it for a few minutes. Refilled the rad and ran it again for a few minutes. The bike runs great but is now blowing the coolant out of the overflow. The fan is not coming on., Fill the radiator with a 50/50 mix of water and coolant. You can usually find this mix at auto parts stores. Screw the radiator cap back on and start the engine. Let it run for a few minutes, then turn it off and let the car cool down again. Check the level of the coolant in the radiator and add more if necessary., There are a few different reasons that your coolant might not be building pressure. You might have a busted radiator cap, or you might have a leak or busted water pump. Either way, low coolant …, Personally, once you pull it out, just replace it to be safe. Replace cap if not already done, check bottle for leaks as noted. Let it sit for 15-20 minutes and idle, watching for activity. The delta is getting high but with egr delete, hard to tell if you have plugged cooler without egr valve residue., The issue of coolant being blown out through the overflow but no overheating is commonly caused by a faulty radiator cap or a clogged cooling system. This can lead to excessive pressure build-up resulting in coolant being forced out of the overflow. It is important to check and replace the radiator cap and ensure that …, , Coolant usually (but not always) gets sucked back into the radiator, especially if the car sits till I the engine is stone cold. The hoses are not collapsed. Usually the level in the radiator is up to the cap, but not if coolant had been pushed out of the overflow. The transmission was checked recently (professional mechanic), some fluid added., Coolant is going to overflow tank but not overheating. Also the return hose to radiator from thermostat has nothing but - Answered by a verified Dodge Mechanic. ... I changed out a leaking coolant line on my 05 dodge 2500 4x4 quad cab. I started it up after, turned the heat on defrost on high, and added coolant as level required in rad. ..., I have 2 gauges both reading the same, while idling between 170 and 180 it starts puking coolant from the overflow. I have a new 180 thermostat and new 16lb cap and have my electric fan set to come on at 180. It's a 406 and has a Proform Water pump. The only thing I can figure is maybe a bad pump not circulating the coolant., Jun 8, 2014 · Right above where your headers connect. It's greenish in color. Remove radiator cap first. Crack that screw or remove it and don't lose the tiny washer behind it. If there is air you should hear it hiss when loosened. Let some coolant come out and tighten it back up. Manual states a little different when doing it but that should tell you if ... , Put a cap on it! The easiest problem to fix could be a faulty radiator cap. It may not be able to hold the pressure because it is worn or broken, allowing coolant to leak past it and out the overflow. Without spending any money, take a cap from another bike and put it on to see if that’s the problem., 1. Coolant Level. You have to ensure that the coolant in your coolant reservoir is the proper level of your coolant. If you overfill it, it can overflow. 2. Radiator Cap. You need to check if your coolant reservoir is overflowing. You may have a loose cap, or you might have a damaged cap. This is where the coolant should be., My Volvo has a new multichamber coolant overflow tank that transfers coolant onto the ground. On one side of the tank, the sensor tells me I'm low on coolant, so I fill it up to the line. Then, the truck runs warm for a few hours, and coolant flows back into the other side, eventually filling up that chamber until it drains out hose to the ground., What can cause coolant to blow out overflow hose, mostly during hard pulls, other than head gasket, or crack? Pre EGR Detroit 60 12.7 in 2003 Sterling. Have owned truck for last 500K, previous history unknown. Runs well and uses one gallon of oil in 10K as it has always done. Oil analysis after problem started does not show coolant in oil., The issue of coolant being blown out through the overflow but no overheating is commonly caused by a faulty radiator cap or a clogged cooling system. This can lead to excessive pressure build-up resulting in coolant being forced out of the overflow., Figured it was low coolant, and added 1/4 gallon coolant and the issue was fixed. Drove back to college today and same issue happened. I let the car sit for 5 hours outside in 20F weather, took the radiator cap off, the system seemed to have way more pressure than normal, and coolant began to spray out of my reservoir tank with the cap still on ..., Blowing coolant out overflow. Thread starter loreak; Start date May 1, 2004; May 1, 2004 #1 loreak. Proven Member. 533 0 Mar 26, 2003 PennsylvaniaUS. Ok it seems if i drive nice its fine, but if i boost alot and basically race around, it doesnt take long until im almost out of coolant and i start overheating, as long as im moving its ok, but if ..., EGR cooler. Take a look at the rear of engine, passenger side, top of transmission with a flashlight. If you see coolant puddled on top of transmission chances are you have EGR cooler failure. This is probably a big ticket repair so you should get it diagnosed properly at a reputable shop., Coolant pushing from. 2018 kenworth t680 isx Cummins. Coolant pushing from expansion tank to overflow tank. Things I've tried to fix it. New expansion/overflow tank, new caps, new egr, engine overhauled, no overheating problems, started at 200k, overhaul at 560k. Still having the problem.