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I've got a 2006 that I am having HVAC issue with. Basically the blower fan works when it wants to. It will work on any speed but comes on randomly. It may come on immediately or it may take 20-30 min of driving. And then it may stay on till I shut the car off or it may shut off within a few seconds. It will also shut off if I try to change the speed. Changing temp or air distribution settings does not affect it.

I first thought resister so I swapped that. No change. So I thought maybe the fan switch. While I was changing the HVAC panel, I noticed the back of the blower switch was partially separated so I thought I had found the problem. Swapped the panel. Still no change. I'm going to check the relay under the dash, then the relay and the rear window defrost fuse under the hood. Though I read that the under hood relay gets power through that fuse but only controls the high setting, and my rear defroster works. I'm having this issue on all speed settings. Any ideas?
 
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