• The site migration is complete! Hopefully everything transferred properly from the multiple decades old software we were using before. If you notice any issues please let me know, thanks! Also, I'm still working on things like chatbox, etc so hopefully those will be working in the next week or two.

06 GrandPrix 3.8 Supercharged - Still over heating

H

hkealiher

New member
I have a 2006 Pontiac Grand Prix - Supercharger gasket, intake gasket, head gaskets and water pump has all been recently replaced - drove it today and it overheated yet again. What would cause this to over heat again? Could it be the thermostat (Drove about 15 miles before it started to get hot and it went straight to warning lights)
 


replace the thermostat they get clogged/old and will stick closed. its a $10 fix if it works if it doesn't you have a new one. Is your coolant clean? your radiator might be sludged up.
 
bars is horrible. heres a how to for flushing your coolant yourself. replace the t stat during the flush.


how to flush coolant.

remove the t stat, put the t stat housing back on, take the upper hose off the radiator, then push it down to the ground to a bucket or let it fly.

get your garden hose out, put it in the rad turn it on, then fire up the car, let it run till clear water pumps out the top hose.

then turn the hose off, run the car till no more water comes out the upper hose. then turn it off.

put your t stat back in, with new gasket, the upper hose back on.



now take 1 gallon of full strength green antifreeze, not the 50/50 crap. ( parts store cheap green is fine to use) dump the whole gallon in the radiator, fire up the car, fill the rad with hose water till its full. top as needed till its ready to be bled of air. it will burp and take coolant as the water in the block warms up the t stat opens up for a few seconds till cold coolant hits it and it shuts again.

now to bleed the air out, let it idle rad cap off till the fans turn on, (when the fans are on the temp is over 195 deg, the t stat is wide open) then open the bleeder screw on top the t stat housing a few turns till a steady stream of coolant comes out the hole, shut the screw, top off the rad. cap it.

done.
 




Thanks for clarification...

I have always shied away from tap water since it can cause mineral build up on aluminum in the coolant and end up with "gunk"...

Distilled water is 0.88c a gallon...We don't cheap out on gas, don't cheap out on water!

Edit -- I have very hard water out here...My shower heads are always plugging the openings where the water flows...
 
Last edited:
Radiator and heater core all flushed out and a new thermostat put in - no more overheating and blowing heat like crazy :)
now seems to be an issue with a sensor I am guessing - I can get up to speed no problem but when I punch the accelerator it chugs - so maybe supercharger sensor?
 


You must log in or register to reply here.
Back
Top