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  #1  
Old 03-16-2016, 10:30 PM
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Location: Alhambra California
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1985 300D AC/ Heater Issue

1985 300D: up until yesterday my AC was working perfectly but the heater was working at times but then not. I replaced the monovalve with an NOS complete monovalve (new in MBZ package but about 20 years old - I did check the rubber diaphram and looks great, no tears and very flexible).

After changing the monovalve I now have constant heat but no AC. The compressor is engaging and yesterday I did have great AC. I changed back to the original monovalve but still have constant heat.

Any suggestions? Thanks.

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Old 03-16-2016, 10:33 PM
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Bump
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Old 03-16-2016, 10:41 PM
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You might need to tighten up, clean up the connectors, terminals to the monovalve.
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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles
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Old 03-16-2016, 11:37 PM
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w123
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Old 03-17-2016, 03:28 PM
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Dirty terminals. Fixed the problem. Thanks.

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