my guess is the little aspirator motor right behind the glove box to the right.. I draws air across the temp sensor.. Its located right under the very right hand vent. Its easy to take apart and oil up.

Bill

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Bill

Backyard Shadetree Mechanic, 30 years running.

1987 300TD
1988 300E (sold, sniff)
1999 S320
1981 Volkswagen Rabbit Truck (Diesel)
2001 Ford Expedition
1988 Suzuki Samurai
On my list to buy: R129, for me, and a R107 for my wife.