Question about 1998 Pontiac Grand Prix

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98 Pontiac Grand Prix Overheating

Temperature gauge will go up very high within a few min. of running the car at this time the low coolant light is not on then within a few more minutes the temp will come way down and the low coolant light will come on. There is plenty of coolant in the vehicle, we have replaced the water pump, radiator cap, supply hose from the reservior as well as checked the thermostate. I even made sure there was no air in the lines. Please, help!

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  • Hippie159 May 11, 2009

    My Grand Prix has the same problem. GM just issued a recall on all 3.8L V6's because of an oil leak that can cause engine fires when the car is running really hot. GM's solution isn't to fix the oil leak, but to install a reservoir to catch the oil and prevent a fire. Nice going GM. Other than that, I love my Grand Prix.

  • Anonymous Mar 17, 2014

    low coolant light comes on until temp gauge goes up

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YOU NEED TO REPLACE THE UPPER INTAKE MANIFOLD. ALSO, YOU WILL NEED TO REPLACE THE LOWER INTAKE MANIFOLD GASKETS. THIS IS A MANUFACTURING FLAW. THE PLASTIC INTAKE CRACKS CAUSING AN INTERNAL COOLANT LEAK. YOU CAN RESEARCH THIS ON LINE.

Posted on Apr 30, 2009

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Stronger machined intake manifolds are availible from www.intense-racing.com and www.zzperformance.com

Posted on May 02, 2009

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