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grand Prix losing coolant while off

N

Noure

New member
No discolouraton in my oil and no leaks i can see under car but my coolant is dissapearing while my car is off...this causes my car to overheat whenever i drive it any suggestions as to what it might be? need to get this fixed asap so any help is greatly appreciated
 




It sounds like a blown gasket to me. My brother was having same problems losing coolant and took it in to find out blown gasket.
 
When you say GP base model 3.8L without mentioning the year, this comes to mind more than an intake gasket.
http://www.grandprixforums.net/97-03-na-l36-uim-failure-60667.html

However while doing the work, I'd suggest plugging the coolant ports and doing the intake gaskets
http://www.grandprixforums.net/how-mod-lim-46931.html

Not sure if this is your issue from the little info you were able to provide. Hopefully the info helps. One way to see if the UIM has fiailed is to pull the throttle body (reusable gasket) and look around the EGR stovepipe. If it's wet, you want to address that asap.
 
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