05 Grand Prix GTP...car overheating/ not heat from heaters

**Rileys05GTP** · 02-15-2012

Hey I got a 2005 Comp G GTP with 70,500 miles on it, just recently the car started to get just under overheating on the gauge and the heater wont blow hot. Thought it may be a thermostat so changed that and it didn't help the temp gauge then just started moving and would still get just under overheating with no hot heat. So I took the car to my mechanic and he found that the water pump was bad so changed that. Still did not fix the issue. So then took the engine apart assuming maybe a bad head gasket or bad head. Had the heads sent into a auto shot and the heads are in perfect condition and didn't even need cleaned up. Really puzzled with what this problem could be were putting the engine back together tomorrow with new head gaskets.

If anyone has any ideas please let me know!! Thanks

**SlowNA06** · 02-15-2012

Fans not turning on?

**Fivefingerdeathpunch** · 02-15-2012

Bleed the cooling system on air??

Did you even try that?

**Rileys05GTP** · 02-15-2012

fans do come on, i don't think we bleed it

**Just Yourshadow** · 02-15-2012

It sounds like a partly or in this case mostly clogged coolant passage. I would flush the radiator and motor to see if you can break thru anything that might be blocking coolant flow.

**Rileys05GTP** · 02-15-2012

ill try flushing radiator when it gets put back together

**rocknnachos** · 02-16-2012

Sounds like there was air in the system.

**Toms04compg** · 02-16-2012

Bleeding the system probably shoulf of been your 1st step waterfpump usually leaks or howls when bad.

**thegipper** · 02-16-2012

You definitely should of tried bleeding your system before tearing down the engine. Always start with the simple things first. My guess is you had air in your cooling system or a blocked coolant passage. Start by trying to bleed the air out of the system. If that doesn't help, try doing a coolant flush. Let us know the results.