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Over to the right of the glove box (I know not much room inside the dash there) there is a small suction fan which draws air through a tube which runs up the right windshield post, to the dome light, through that small slotted square hole in the dome light, which draws air through the incar temp sensor. Over-engineering at it's best. The fan needs to either be replaced or you can take it out, try to clean and lube it up. I think the noise might go away if you try shutting off the climate control, if you want to see if that affects it.
Gilly
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