Just purchased a 1980 300SD with about 175,000 miles on odo. Engine about 100,000 old and trans replaced about 6 months ago. When I got it, A/C not working, but have replaced compressor and servo (ouch!!) and now A/C works but no heat. BTW, car won't stop running unless climate control fan is on. Any ideas on getting the heat working?

Thanks

Maybe a vacuum leak. Check all connection including behind glove box and under dash on passenger side.

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