Hey, I just bought a '90 GXL, and yesterday the add coolant light came on after driving on the freeway for a while. At first it was intermitent, but then it was constant until I slowed down and got off of the freeway. Now, after I've driven the car semi-hard for a while the light comes on until I let off the car. I'm confused and kind of worried about it, so are there any ideas? Thanks much, I appreciate all of your help.

-David Guy
Andern Research Labs, LLC.

 

well on mine it was only the rad cap the problem

is wasnt picking up coolant from the overflow

check if the cap is loosing compression when the car is off

 

coolant might be seeping out of the radiator fins. my friend's 89 GTU has that problem and the buzzer comes on almost everytime he makes a tight turn.

 

have you checked the coolant level in the rad?? is it full... is the overflow tank up the to full mark?