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#1
12-01-2004, 10:09 AM
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1982 W123 climate control
Ok, I'm having trouble determining whether this is a monovalve problem or not. It was 37F this morning, and I needed heat. I turned the temp wheel to MAX, and hit the middle button on the CC switch. Nothing but cold air came out. I thought if I drove around a little bit, it would eventually warm up. It did not warm up. So, I'm thinking this is a monovalve problem. But, last week, it was close to 80F outside, and the only way I could get cool air in the car was to set the temp to MIN, anything other than MIN would get me HOT air. So, what's the deal here, do I have a broken sensor, or monovalve or what?
-Joe
__________________
'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. 
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#2
12-01-2004, 10:41 AM
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try cleaning the contacts for the wire connection at the monovalve also inside the plug itself. that might cure it like it did mine.
could be the in dash temp sensor as well that is shot
__________________
1984 300D Turbo - 231k....totalled 11/30/07 RIP
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#3
12-01-2004, 11:28 AM
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The monovalve opens if it does not receive power. A bad connection will result in maximum heat all the time. Try disconnecting the monovalve electrical plug and see what happens.
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