My car keeps running hot I've changed the thermostat but it's still running hot no pressure is coming out of the pressure relief valve

Asked by Sep 04, 2015 at 12:38 PM about the 2004 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

I have a 04 potiac

5 Answers


Check to see if the fan is coming on when it should, look at the fan sensor. Also you may want to flush the entie system with a flushing agent, some of the passes may be plugged in the radiator, clean the outside fins of the radiator with a good cleaning solvent. It may be plugged with leaves and bugs. Also change you radiator cap. Make sure you radiator tank is filled to the proper level.

Best Answer Mark helpful

The car do sent even wanna go pass 4RPM WHEN I TAPPON THE GUESS I WENT TO auto zone and braught PEAK RADIATOR SUPER CLEAN+flush

The fan is coming on when it's supposed to


Ok great... make sure you bleed the system after you clean it, here is a you tube on how to bleed a system. (try and save as much of the antifreeze if its new ) the I also attached a video on how to flush a system..


Sounds like the coolant level is low. Are you sure it was full to begin with and that its full now? That's the most common cause of overheating in these cars.

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