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There are 5 or 6 temp sensors through out the car for the ECC. To find the noise, I suggest taking off the passenger kick panel and pulling out the glove compartment.
As to the noise stopping when turning the passenger temp dial, it is possible that the left and right temps are not totally accurate. To verify, turn the dirvers side down a couple of clicks and see if it goes away. The unit is probably trying to adjust a vent that is already wide open.
Klaus
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The more I learn, the more I forget. So why learn?
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