2002 Pontiac Grand Prix Can you figure this one out??!?!

2002 PONTIAC GRAND PRIX
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LEWA5825
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Electrical problem
2002 Pontiac Grand Prix V8 Automatic 79,000 miles

I might sound a little crazy but I can't seem to get an answer to what is going on with my car... There seems to be some crosswiring or something that is going haywire. The symptoms: When I go to turn on my heat/ air on, it causes my running lights to shut off. The heat/air only works inconsistently. Now it is more often never working than working but sometimes I manage to get lucky. When I turn the heat/air back to "off" then after about a minute the running lights will turn back on. I am able to actually turn the lights on when the running lights are off. I have checked all the fuses and they are all fine. I had my battery checked and it was bad... I replaced it and still same problem. What could be the problem? Where do I take it? And how do I avoid spending a fortune?? Thank you so much!!!!
Aug 6, 2010 at 12:52 AM
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MMPRINCE4000
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Do you have a security light and is it flashing with ignition on?
Aug 6, 2010 at 7:45 AM
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LEWA5825
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I am assuming that you are talking about the light on the dashboard??! If yes.... I do have that and it does stop blinking when the ignition is on. Is that good or bad? Thanks :)
Aug 6, 2010 at 6:21 PM
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MMPRINCE4000
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Try resetting the security system, instructons are in owners manual.

While I don't think this is the entire problem, it may be a contributing factor.
Aug 7, 2010 at 8:01 AM