Question about 1995 Pontiac Grand Prix

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I have a 1995 Pontiac Grand Prix GTP 3.4L DOHC....... The engine is over heating (yes it has coolant in it).... and I had noticed a leak in the coolant so we replaced the radiator (which had a hole in it) ... and it still seems to be overheating. It goes above 210 (fan kicks on at that time - most of the time) but at time it gets up to 245 or so.... just trying to find out the next probably fix. We considered the thermostat, but was hoping there was other options incase it didnt work. also someone posted online that replacing the Radiator cap could also assist in the problem. Any suggestions?

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  • Pontiac Master
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REPLACE THERMOSTAT TO BE ON THE SAFE SIDE.IF YOU PUT NEW RADIATOR IN MORE LIKELY YOU NEED TO BLEED COOLANT SYSTEM CHECK COOLANT LEVEL WHEN ENGINE COOLS DOWN. YOU HAVE AIR IN COOLANT SYSTEM.AIR WILL EXPEL AND COOLANT LEVEL DROPS ADD MORE COOLANT UNTIL YOU HAVE RIGHT AMOUNT COOLANT IN RADIATOR.DONT DRIVE CAR UNTIL COOLANT SYSTEM BLEED.WHEN THERMOSTAT OPENS TURN OFF ENGINE WAIT A WHILE THEN CHECK COOLANT LEVEL KEEP ADDING UNTIL COOLANT LEVEL STOP DROPPING IN RADIATOR. USE LARGE RAG OVER RADIATOR CAP TO KEEP FROM GETTING SCALDED BUT WAIT UNTIL COOL DOWN ENOUGH SO YOU WONT GET SCALDED.

Posted on Sep 01, 2010

  • wcwoaaron Sep 01, 2010

    I will attempt this and see what happens. many people have thrown out ideas for solutions and most of them have included thermostat and bleeding..... also the water pump has been mentioned...

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Posted on Jan 02, 2017

duane_wong
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SOURCE: I have a 1995 Pontiac Grand Prix GTP 3.4L

Maybe a backflushing of the cooling system can help to make it cool more efficiently.

Sediment can build up in the cooling system causing a lack of flow of coolant.

Also, the thermostat could be stuck closed, as others have suggested.

Posted on Sep 01, 2010

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    I have a 1995 Pontiac Grand Prix GTP 3.4L DOHC....... The engine is over heating (yes it has coolant in it).... and I had noticed a leak in the coolant so we replaced the radiator (which had a hole in it)...
    Maybe a backflushing of the cooling system can help to make it cool more efficiently.

    Sediment can build up in the cooling system causing a lack of flow of coolant.

    Also, the thermostat could be stuck closed, as others have suggested.

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