Put the year and model of the car you're referring to in your signature so we can know what you're talking about.

There are 3 possible A/C systems in W123 cars, depending which year and model you have, and they're all very different.

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1983 Mercedes-Benz 240D
Automatic, A/C, Power Sunroof, Power Right Side Mirror
231K Miles FOR SALE MAKE OFFER