Question about 2003 Hummer H2

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My H2 is making Chocolate Milk Coolant!

My 03 H2 is loosing transmission fluid and it appears that it's going into my coolant system.. because my overflow is flooding a chocolate milk looking sustance. Is there any ideas on how this is possible?

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The radiator has an internal trans cooler that must be leaking, the radiator needs to be replaced and the cooling system flushed of all the trans fluid. Usually the radiator hoses and hoses going to the heater core will need to be replaced because the trans fluid will soften the rubber and make them swell. Good luck, Honda Al

Posted on May 19, 2009

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I recently replaced my intake gaskets and after repairs im having transmission up shifting problems.


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97 mercury mountaineering has oil in the radiator and coulant. Help please!


OK, lets figure out what's happening here. You are seeing "oil" in the radiator and coolant. Chances are it is not engine oil. The inly way engine oil can get into a radiator would be if a head gasket was blown. Even then, oil at those locations is not under as much pressure as the coolant is, so when a head gasket blows, what usually happens id that the coolant ends up in the motor oil and oil pan. Verify this by looking at the dipstick to see if it is extremely full. The oil could look like choclate milk. Also, open the oil filler cap and look for signs of chocolate brown goop. I'm betting you won't find that. This is good, but also bad. What you probably have in you coolant is transmission fluid. The transmission oil is circulated through a cooler located inside the radiator. If this cracks or breaks the transmission oil can leak into the coolant. However, at different times the transmission oil and the coolant are at odd with one another pressure-wise. This means that if you have transmission oil in the coolant, you probably have coolant in the transmission oil. This is very very bad, You will need to have the transmission serviced and possible overhauled to repair the damage. You will also need to flush the trans oil from the coolant system. This will require you to replace the radiator, ALL HOSES as well. Coolant hoses do not play well with transmission fluid . The inside of the hose sort of melts and gets real soft and gooey. Changing the hoses and radiator and flushing the motor should work once the transmissionhas been serviced.

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Transmission oil found in radiator


there is a cooler for the trans fluid that runs threw the f the radiator the cooler splits and trans pressure being higher while running pushes into the coolant how ever as it cools down the coolant pressure can push the coolant into the trans so see if the trans fluid looks like a straw beery milk shake if so try and keep flushing the trans until the fluid is clean and fresh if the trans makes it threw the coolant then you will need to flush the cooling system i use pinesol it breaks down the oil

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1 Answer

Blowing white smoke


white smoke is caused by-- water or anti-freeze entering cylinder . if in radiator or the overflow tank. it will look like a chocolate milk shake. check on oil dipstick for traces of water or anti-freeze. also, a bad head gasket will let water or anti-freeze in combustion area. head gasket symtoms if bad. Symptom #1: Chronic Engine Overheating
Symptom #2: Significant Drop in Coolant Level Symptom #3: Mixing of Coolant and Engine Oil
Symptom #4: White Smoke from Exhaust Pipe

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check your coolant fluid in the radiator and coolant pressure tank on side of the fender. nissan has some issue where coolant mixes with trans fluid in trans and the transmission goes south. if your coolant is not nice and green, than it mixed with trans fluid and your trans along with the radiator will have to be replaced. also check your trans fluid and make sure its nice and red, not pink and milky like strawberry milk. that is another sign of radiator cooler failure. start there and let me know what you find.

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If it's losing tranny fluid and there are no visible leaks externally, try looking in the radiator and seeing if it looks like chocolate milk in there.More than likely you blew your transmission cooler which is built into the radiator, and that has been mixing with your engine coolant.Get back to me, I hope I could help..Thx,

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