1999 Pontiac Grand Prix over heating

Tiny
CASPER346
  • MEMBER
  • 1999 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 133,000 MILES
My car keeps overheating after driving it for a short period of time. This happens befor the gauge reaches the overheating mark. The car then stalls when turning it off then on again, it takes and half and hour for the car to start back up.I got the car checked and got a cooling system flush, and changed the therostat, but still had the overheating problem.
Tuesday, May 27th, 2008 AT 1:13 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.

Pressure test: do not do a pressure test if there's leakage at the headgasket this might cause coolant into the cylinders and lock it up or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.

If the block and pressure test passes check the following: Thermostat, Pressure test the Rad. Cap, Clogged radiator, Fan clutch, Radiator electrical fan, collaspe hoses, water pump.
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Tuesday, May 27th, 2008 AT 1:26 PM

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