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  #1  
Old 09-29-2007, 11:30 PM
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Mysterious 123 Heater

Hi the heater in my 300d works in a strange way. It works up to 30 MPH and blows hot air after 30 MPH it works as an AC?? Any thoughts? Thanks

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Old 09-30-2007, 01:56 AM
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Rebuild the MONO valve on the firewall. Should fix it. My wifes old '84 did the same thing.
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Old 09-30-2007, 10:14 AM
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Quote:
Originally Posted by mamali View Post
It works up to 30 MPH and blows hot air after 30 MPH it works as an AC??
That's a classic symptom of a torn monovalve diaphragm.

Obtain one of these:
http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2650Q36L326Y0JME7T&year=1984&make=MB&model=300-DT-001&category=R&part=Mono+Valve+Repair+Kit
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Old 09-30-2007, 11:12 AM
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Thanks guys

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