OVERHEATING Pontiac grand am gt 2002 3.4L v6
My Pontiac Grand Am GT 2002 is
overheating I had changed the water pump
and the thermostat end my brother has
blood out the air three separate times. It is
been running fine for 2 weeks until just the
other day and it started overheating again
blowing out cold air through the vents. Now
ever since then it's been okay again today
had begin to overheat when we pulled over
and parked it and turned the car off I could
hear the air bubbles again making a popping
sound. I think it could be the cooling system
comma the fan, the radiator, or a head
gasket. I need feed back. It may be leaking
I mean bled****
These engines are pretty notorious for blowing head gaskets. Pull the oil dipstick and see if there's white milky "goop" on the dipstick. If so, it's a head gasket. Also, with the engine cold, use a cooling system pressure tester and pressurize the cooling system to 15 PSI. It should hold the pressure for 15 minutes minimum. If not, look for where it's leaking. If no leaks can be seen start the engine. If the needle on the pressure tester gauge bounces it's a blown head gasket. HTH. -Jim
The problem is related to the computer sending a ground signal to the cooling fans. I just fixed my daughter's 2003 Grand Am GT. The problem is what looks like a relay mounted to the driver's side fender wall. It's located directly across from the air filter assembly. Pontiac has located this device there and all your major grounds join here. The mounting plate attached to it becomes corroded which interferes with the grounding signal from the computer to turn on the cooling fans. The bolt that held it in place was actually so rusty that the head of the bolt had broken off as I removed it. I used a circular wire brush attached to my drill to remove the corrosion from the back plate. Used the same brush to create a new bear metal spot on the fender and a self taping screw to reattach it. No more over heating from there on, Fans triggered and varied speed as they should.
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