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flush it dissconect both hoses and lfush it out good then refill with coolant flush it dissconect both hoses and lfush it out good then refill with coolant

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16y ago

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If there are tiny bubbles coming out from your radiator when radiator cap is open and have oil leak problem coming from valve gasket are they related?

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When checking the antifreeze there is oil in the radiator the transmission dipstick shows the same mixture what could cause this?

USALLY it's because the Transmission cooler that's located inside the RADIATOR HAS DEVELOPED A LEAK.The COOLING system & TRANSMISSION need 2 b FLUSHED after the RADIATOR is REPLACED -- OR BYPASS the RADIATOR TRANS cooler & put on an EXTERNAL cooler INFRONT of the existing Radiator. It sounds like the head gasket is leaking. I just had the same problem. It started with noticing just a thin layer of light brown foam when I removed the radiator cap. There was no foam or anything else wrong with the engine oil or trans fluid. My mechanic took a quick look at it and said to just keep an eye on it. I checked it every week with no change noticed, then sort of forgot about it for a month. When it started to shift a little rougher than usual, I checked the trans fluid again. This time the fluid was a nasty color of rusty brown and very opaque. Apparently it is not that uncommon to get a leak between the radiator coolant and either the engine oil or the trans fluid. Just speaking from my own experience, I believe it is more common to have the engine oil leak (bad head gasket or cracked head) in which case there will be obvious white/brown foam in the engine (on the oil cap) when it is checked. The trans fluid is under higher pressure than the radiator coolant so most of the flow is from the trans to the radiator, but as the system cools down, it can (and does) flow the other way. It just takes a little longer to notice the problem. Since radiator fluid can destroy an automatic transmission and trans fluid can destroy the seals in the radiator system it is very important to figure out what�s going on as quickly as possible...and NOT �just keep an eye on it�....won�t be going back to that shop. My van (a 94 Pontiac Transport) is in the shop now getting a new radiator (has two internal trans coolers inside of the radiator), and when that�s done I�m driving it directly to have all the trans fluid flushed. With any luck, it will start to shift smoother ...if not, it will have been a VERY expensive lesson. Hope this helps.


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