My "93" bonneville heated up and wouldn't move-coolant hot & had trans. fluid in it. Trans. fluid level was low.
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1993 Pontiac Bonneville Question: Can transmission fluid get into coolant?
Answer #1Autohaus Lake Norman from Autohaus Lake Norman, January 10, 2013, 16:53Journeyman
Yes, your radiator has a transmission cooler built into it. If the transmission cooler starts to leak, it will pump transmission fluid into the coolant. If this is the case, you should see transmission fluid floating in your cooling system, either in the overflow jug or under the radiator cap.
Answer #2davidanderson7 January 10, 2013, 16:54Rookie
It is possible depending on the setup of your radiator, I'm not too familiar with pontiacs, but its possible that you have a cracked radiator.