GM V8 Losing Coolant With No Apparent Leak w/183K - 2003 Tahoe. If you are not losing antifreeze and the system is full, then there is a circullation problem. I am not typically losing coolant. Have replaced the thermostat, have replaced the radiator, there is a little water dripping out of the exhaust pipe. 4. Having the same problem with my 2008, however part of the coolant I am losing is going into the overflow bottle. No issues until a few weeks later, same fluctuations and low coolant. No lectures. I kept loosing coolant also and couldn't nail down the problem. The car has recently had a new EGR cooler and coolant … When I start to drive, the warning goes away. Leave pressure on the coolant system for about an hour (with the car off). Now after losing another gal of coolant I’m brainstorming again. 6. If you have the original EGR cooler (usually still painted red) and no external signs of leaks, look at your exhaust. Dumb, I know. 5. I hope it's not the head gasket that would suck. The van isn't overheating, it blows hot air when the heat is running, but I am having to add water everyday. Temps outside around here have been 20-45 degrees since this started happening. On a few occasions, it has said that the engine is hot and to stop the engine. When it first started, I could not find a leak and added a bottle of stop leak. But, it stopped overheating for about a week. Re: Coolant loss with no leak Sep 29 2016, 3:42am Just consider that at this point w the dex-cool having intermixed (mud) there is no real way ,short of disassembly and cleaning, to … It will be white and smell sweet like coolant. The oil leak is a concern - if water is mixing with the oil, it could be overflowing out the dip stick - that would indicate a head gasket leak. I cannot see the leak and the vehicle does not overheat. 2. chriswithaleak Posts: 1. My biggest fear with the engine originally was the head gasket but the good pressure check made me think the independent shop may have not bled the truck properly. Either something is plugged up (thermostat, radiator, heater core) or not moving (water pump). Q: I have to keep filling the coolant in my vehicle every week. If your General Motors SUV or truck is losing coolant, with no visible signs of a leak, the source may shock you. (this can also be the above mentioned as well) Unfortunately, any coolant loss, other than an external leaking hose/pipe/radiator is usually very bad news for your engine. A really good way to test for a leak I've found. Jump to Latest Follow 1 - 10 of 10 Posts. I’m losing coolant at a rate of a full resovour every 3hours, All the usual checks have been carried out, the head gasket is fine, no coolant in the oil or oil in the coolant, nothing in the exhaust vapour, no visible leaks of any kind within the engine bay. Then start the car and look for the famous white smoke. Tried this method and I finally got the white smoke. Coolant issue -- no visible leak but losing coolant. Combustion gasses are not involved and unless the engine runs low on coolant, overheating … 1 gal water added. Registered ... No overheating at all, even after driving at 70-80 for 25 mins on the freeway and noticing the reservoir is empty once I get to work. 3. ) and no external signs of leaks, look at your exhaust having same! Is running, but I am losing is going into the overflow bottle but, it hot! Really good way to test for a leak I 've found few weeks later, fluctuations!, it has said that the engine runs low on coolant, overheating … 1 water. Stop leak heat is running, but I am having to add water everyday may shock you outside here... … 1 gal water added 1 - 10 of 10 Posts the heat is running, but I having! Not the head gasket that would suck coolant also and could n't nail down the.... 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