Question about 1988 Pontiac Bonneville

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Transmission fluid & radiator fluid keeps getting low. know approx. where leak is, drivers side front on inside of front tire. would a leak in radiator cause trans. fluid to leak also from radiator? was told that trans. fluid and radiator fluid circulate together.have had repairs on lines (3) to radiator, still leaking, do not think it leaks when car is running, have had seal replaced also. do i look to radiator repair for solving problem?

Posted by trece1952 on


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Antifreeze and transmission fluid don't run together any ware, but are both cooled by the transmission. There are coils inside the radiator that the transmission fluid runs through to be cooled. It would have to be a leak inside your radiator in the coils that cool the transmission fluid, and a leak in the exterior of your radiator leaking both fluids out of it. If your transmission lines are leaking in your radiator you should be able to see the transmission fluid (BRIGHT RED) in your overflow tank. Also the puddle under your car should be a red and green mixture kind of going everywhere. If they are to different leaks then you would be looking for a transmission leak and a coolant leak. Also check your oil and make sure that you don't see anything unusual looking about it. If you find that you have transmission fluid in your radiator I would contact whom ever replaced the lines for you, they should have been able to see this was the problem. Good luck hope this helps you narrow it down to the actual problem, if you have more questions reply to this post I will try to assist you further.

Posted on May 25, 2011



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Your transmission fluid runs to your cooling system to cool the transmission oil. So, in answer to your question, one of the two transmission lines (one in, bottom and one out, top) could be leaking from the cooling system.

Bring your vehicle in for a cooling system pressure check. Another thing to keep in mind when inspecting leaks is that where you see the leak may not necessarily be where the leak is from. While the leak will drip down, the wind from when you're driving will splatter the leak all over the under-carriage of your vehicle making it look like leaks are happening where they in fact, are not.

Posted on May 25, 2011


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