Hello Mercedes fans. Trying to figure out what this part is, and how it pluggs in. It is on the drivers side, close to front. Has red cap on it, and appears to be routed near AC. I have attached a picture. Please help. Thinking AC, but dont assume anything.

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Thats the temp switch for the A/C condenser fan. Two leads that should plug in to the harness near there. This turns your condenser fan on at the proper temp for good cooling.

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Western NC
1987 300SDL W126 Turbo Diesel 335,000 + miles
1976 300D W115 275,000 miles+

It's actually a high pressure switch on the Gen2 cars. But yes, the two spades should plug in to the harness coming off the switch.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

Thank you both for this. Got it plugged in. Have no AC at this time, so havent heard fan turn on...but good to know its there.

Thank you both!