I have a 1994 E320 and only defrost was working in the car, no matter what button I pushed. The temperature adjustment worked fine, adjusting the temperature to A/C and heat. Both systems worked fine.

I took the push button out to replace it and put a used one in. It made a humming noise and did not work.

I put the old one back on and now there is no funtions at all, but I can still feel the A/C compressor kick on.

If you have any input on this matter specifically please respond. If you do not know what your talking about and want to chat please refrain.

Thanks

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Ryan
1985 300D Turbo Diesel
1984 200 Euro