Question about 1998 Pontiac Bonneville

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Heater blows sometimes but not others

My 98 pontiac Bonneville heat works sometimes but most of the time you have to be driving around to even feel the heat?

Any Ideas???

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  • okferrell Jan 23, 2009

    Some times it will come right on in the mornings just like normal and at other times it will not come in at all, or it will come on when I hit a bump.

    I have checked the wiring to see if it may be a loose wire but found none to be loose. At other times it will come on like normal until I turn the car off and then it will not come back on.

  • Anonymous Feb 01, 2009

    I have the same problem with a 1997 Bonneville SSE. It does the same thing you described when using the air conditioning or the heater. It will get hot or cool but the fan will not come on. Any help with this would be great.

  • vikfan935 Apr 03, 2009

    fan dosn't come on

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Cheap resolution try adding anti-freeze.

costly solution may be a bad heater core.

Posted on Jan 29, 2009

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hi,
i actually used to have a 1995 pontiac grand am that did the same thing....only difference was i didn't have to restart the car....usually what i would do was drop the car in neutral and gas the car and i'd notice my temp gauge go down and my heater gave heat.....chances are it's a sticky termostat. Hopefully that helped.

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