Under the hood, passanger side, you will see a wiring harness plugging into the firewall about 6 inches from the top of the firewall. That is attached to the blower motor resister. Check the plug for evidence of it melting. If it looks good, unplug the harness and you will see the blower motor resister. It is held on by two small bolts. Remove it and replace it with a new one. They are cheap. Chances are that is the problem.
Let me know if you have other questions and if it helps.
Joe
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Sunday, October 3rd, 2010 AT 3:10 PM