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1991 Pontiac Grand Prix 3.1 V6 Problem

Tiny
RAISMOLENS
  • MEMBER
  • 1991 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 200,453 MILES
I am having a cooling problem with my grand prix. Has new water pump and thermostat. Temp guage goes to 260 then drops to 190. Low coolant light comes on then goes out. Coolant reservoir fills completely and overflows at low speeds. When car is turned off reservoir fills and bubbles. Thinking it could be head or intake gasket, any thoughts?
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Thursday, July 2nd, 2009 AT 2:36 PM

3 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Was this going on before water pump and thermo?
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Thursday, July 2nd, 2009 AT 2:57 PM
Tiny
RAISMOLENS
  • MEMBER
  • 7 POSTS
No the problems only started after the waterpump went out. The car was driven about 15 miles in a hot condition to get it home
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Thursday, July 2nd, 2009 AT 8:14 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
May have air block check around coolant resevior for a small screw in a hose or next to thermostat a bleeder valve. Open either add coolant till it comes out. If cah fine neither jack up front of car run add coolant until full.
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Saturday, July 4th, 2009 AT 10:48 AM

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