Question about GMC Sonoma
Very likely that the oil you have found in the radiator is transmission fluid. There is a built in transmission cooler that is inside one of the radiator tanks. If the cooler fails, trans fluid will get into the coolant and when shut off, coolant can migrate into the transmission. You need to replace the radiator and then drain and replace the trans fluid. You cannot drain all the fluid (pan removal only gets rid of about half) so it's best to do that once using a low priced but proper grade of fluid, run it for about an hour, then drain again and re-fill with a better quality fluid. (also not a bad idea to use some lucas trans conditioner in there).
Hopefully, you haven't damaged the transmission, otherwise you may be looking at a rebuild.
Posted on Dec 31, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
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Please see my tip at http://www.fixya.com/cars/r6003525-abs_traction_control_lights . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.
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