I'm just trying to figure out what is going on with my car and what needs to be done.

Kristina Blevins

Asked by Jun 19, 2016 at 12:17 PM about the 2007 Chevrolet Cobalt 2 Dr LS Coupe

Question type: Maintenance & Repair

i have a 2007 chevy cobalt LS and just recently put a 2008 chevy cobalt
motor in the car. as far as i could tell nothing was wrong with the motor.
also had a radiator put in. after a week of driving it i noticed it wasn't
shifting properly so i figured it needed trans fluid. come to find out it was a
bad radiator and trans fluid ended up in the water resevoir and coolant
ended up in the transmission. so i went and had it flushed and filled and
now the resevoir has a pink milky color in. and it has a hard time shifting
after 2nd gear. any ideas or thoughts would be much appreciated. also the
photo i have attached is what it looked like after it was   flushed and filled.
thank you.

1 Answer


So either the new radiator has split in the trans cooler or it wasn't properly flushed, and now the transmission solenoids are fouled up. So what I would do right now is totally bypass the cooler in the radiator and install and auxiliary trans cooler, re-flush the transmission and hope that cures the shifting problem, if it doesn't then the trans will have to be most likely overhauled. Then flush the cooling system again, it may take 3 or 4 times to get it all out. You may have to take the recovery tank off and manually clean it.

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