WHAT'S WRONG WITH MY COOLING SYSTEM?

2003 Pontiac Grand Am

Tiny

Fathom

June, 7, 2012 AT 7:06 PM

Ok, the car started pushing coolant out of the overflow. Also boiling in the rad. Coolant seemed to be circulating so not the water pump. No coolant in the oil and no oil in the coolant and no white smoke. Not the head gasket. So, Had a mechanic replace the thermostat. He has 30 yrs experience so not backwards. Car is still overheating but not pushing out coolant. What's the problem? Car is an 03 grand am gt.

FOUND 1835 RELATED QUESTIONS

12 Answers

Tiny

Docfixit

June, 7, 2012 AT 7:08 PM

Cooling fans operating?

Tiny

Fathom

June, 7, 2012 AT 7:14 PM

Yes, fans are working. It's got the 3.4 as well. This really has me confused. I'm thinking maybe blockage but I'm not sure. Everything seems to be doing what its supposed to but it just overheats. Oh. And from cold, it heats up quickly.

Tiny

Docfixit

June, 7, 2012 AT 7:17 PM

Suspect radiator blockage when hot feel radiator any cool spots?

Tiny

Fathom

June, 7, 2012 AT 7:18 PM

Yes. Blowing cold air.

Tiny

Fathom

June, 7, 2012 AT 7:20 PM

Oops misread the reply. Haven't really felt the rad but last night when it overheated all the supports on top seemed cold.

Tiny

Docfixit

June, 7, 2012 AT 7:42 PM

Does top hose get hard and feel hot? Hjas radiator cap been tested to hold pressure? Bottom hosewarm and not collapsed?

Tiny

Fathom

June, 7, 2012 AT 8:58 PM

No, top hose is not really hot or hard. Rad cap seems ok. May try a new one. Not sure about bottom hose.

Tiny

Docfixit

June, 7, 2012 AT 9:02 PM

Was Air bleed valve opened when filling?

Tiny

Fathom

June, 7, 2012 AT 10:18 PM

No. Could it be so simple as air lock?

Tiny

Docfixit

June, 8, 2012 AT 2:15 PM

Yes if air bleed valve was not opened

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