Question about 1997 Pontiac Bonneville

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My heater will not give out heat when it is running

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  • Pontiac Master
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Check the 2 tubes that enter the firewall that lead to the heater core. If they are not getting hot, when the engine is hot, then the heater core is plugged.

Otherwise, if they are getting hot, then there is a blend door problem.

Posted on Nov 03, 2010

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  • Pontiac Master
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You will need to check the coolant level first, low coolant will cause this, the other things that would cause this is the heatercore may be clogged, to free it you will need to use a water hose and remove the hoses from the vore then flush water through both sides of the heater core, you will see the dirty blockage material come out, flush it both one a few times. the last thing it may be is a vacuum leak to the controls, theres a vacuum line from the engine to inside the controls and the hose sometimes breaks at the engine you will need to take a good look at the vacuum line at the engine intake area. hope this is helpful.

Posted on Nov 03, 2010

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