2000 grand am 3.4 changed my thermostat changed my temp. coolant sensor. why is my car still running at 200-220 and my temp gauge likes to jump up and dwn too only when it's heating up though whats up

Susan Schorsch

Asked by May 25, 2015 at 06:08 PM about the 2000 Pontiac Grand Am SE1

Question type: Maintenance & Repair

changed thermostat changed coolant temp sensor. my car never ran above 180 before
last summer when the temp gauge spiked.... now it runs at 200-220 it has shut off on
me once before.. my fans kick on and off like the are suppose to i'm now at a loss
please anyone with any info help... when i replaced thermostat left cap off of res. it
bubbled up i put cap on temp made it to 200 then kicked back down now it's staying at
195-215 when it gets up to 215 i turn on my heater and it stays around 195.

4 Answers


GMs 3.4L V6s are notorious for blowing head gaskets. Pressure test the cooling system. These engines also have to be bled after the cooling system is serviced. I suspect it's a blown head gasket though since it started all of a sudden. How many miles are on your Grand Am? HTH. -Jim

Susan Schorsch

too many lol almost 200,000 but the headgasket was just replaced last summer

2 out of 2 people think this is helpful.
Susan Schorsch

what is the best way to bleed this kind of system it doesn't have a cap it just has the res. on it

1 out of 1 people think this is helpful.

There's 2 bleeder screws. One at the thermostat housing and a second one on the thermostat bypass tube. With the engine cold, remove the radiator cap and open the bleeder screws. Add coolant until a steady stream of coolant comes out of the bleeder screws. Close the bleeder screws and fill the radiator to the very top. Put the the radiator cap back on and fill the plastic recovery tank to the "cold" mark. HTH. -Jim

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