Question about 1997 Pontiac Bonneville

2 Answers

Heater control wont heat. AC and fan works fine

When turn on the defrost Ac comes on as when turn on the mode AC comes on .Turn off AC and hit auto and raise temperature but no heat. Any ideas would be appreicated

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  • Anonymous Mar 19, 2014

    This has happened before when I turn on my wipers or radio, then comes back on within seconds, today though did not and even once I was home and shut off my car then turned it back on , the defrost and heat did not start

  • Anonymous Mar 28, 2014

    radiator fan works only when ac or heat is turned on

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2 Answers

The heater core was plugged and took 8 flushes to clean it . Would clean it would stop again. Have heat now .
Thank you everyone for helping.

Posted on Sep 20, 2008

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Mechanical or vacuum operated valve that releases hot coolant into the heater core may be stuck closed. or the heater core may be clogged. hope this helps.

Posted on Sep 17, 2008

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