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-   -   300SD Heating, Winters coming! (http://www.peachparts.com/shopforum/diesel-discussion/135187-300sd-heating-winters-coming.html)

randle2318 10-24-2005 04:27 PM
300SD Heating, Winters coming!
 
I know heating is a common problem in these cars so hopefully someone will be able to help me out before winter comes! My heat doesnt work. The fan blows when on defrost, but not heated air. On all other setting no fan, but I can hear the valves switching to panel or floor. Please help me.

tenknots 10-24-2005 08:08 PM
Do a search for monovalve.

waybomb 10-25-2005 09:19 PM
The monovalve is an easy fix.

Jim H 10-26-2005 07:10 AM
Quote:
Originally Posted by randle2318
...The fan blows when on defrost, but not heated air. On all other setting no fan, but I can hear the valves switching to panel or floor. Please help me.
This could be a fan problem, with worn brushes that only allow it to run a full speed. It could be a bad Control Unit, not signaling the fan to run except in Defrost.

The switching you hear is probably the solenoids that apply vacuum to the various air flaps.


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