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-   -   Mysterious 123 Heater (http://www.peachparts.com/shopforum/diesel-discussion/201064-mysterious-123-heater.html)

mamali 09-29-2007 10:30 PM
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

Motorhead 09-30-2007 12:56 AM
Rebuild the MONO valve on the firewall. Should fix it. My wifes old '84 did the same thing.

tangofox007 09-30-2007 09:14 AM
Quote:
Originally Posted by mamali (Post 1633139)
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

mamali 09-30-2007 10:12 AM
Thanks guys


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