Question about 1999 Pontiac Bonneville

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Heater only works sometimes

When heater is on it doesn't always kick on right away. It will adjust to low and then back to high on it's own

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Take the heater assembly thats located in your dash!! take it out unplugs !! replace it!! its a gm dealer product plug it back in that should fix the problem.....................

Posted on Feb 01, 2009

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1996 buick centrey fuse box


Does the compressor kick in when you turn it on?(if not it could be the a/c switch or the power to it, the a/c clutch wire connection, the clutch itself, or it's low on freon) You should hear the clutch kick in when you turn the a/c on. Low freon will also cause the clutch to not kick in. Remove the low-pressure switch plug and jump it with a piece of electrical wire. If the clutch kicks in, you just need to add some freon. Put the plug back where it was after you remove the jumper wire.
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Good luck, they can be a pain, but with careful, step by step troubleshooting it can be fixed. There is plenty of information about a/c online to help you out. Try googling in: auto ac troubleshooting tips for more info. garcuda

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