Question about 1998 Pontiac Bonneville

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Car throws heat when first started, then turns cold

After the car is warmed up, the heat works, then 20-30 seconds later the heat turns cold. I think it is a blend door accuator that is faulty, but I need to know how to get to it to test it

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  • rodelco Dec 21, 2008

    1998 Bonneville - Outside temperature indicator flashes for about 30-60 seconds before the blend door apparently switches to NO HEAT. Any idea what the flashing indicator is telling me? Thanks.

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First of all you need to take this part of the control unit out but leave everything connected so you can see if it is moving also check to see if there is any vacuum lines off the back of it cause this will cause it also

Posted on Jan 05, 2009

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Posted on Jan 02, 2017

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