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Old 10-02-2003, 07:07 AM
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Join Date: Mar 2003
Location: Houston, Texas USA
Posts: 59
300 SD Heater / AC Control

The ball that rotates, to adjust the temp (heat and/or ac), does not produce an immediate result. For example, if I turn the heat down, it takes 3 or 4 minutes for the change to take place. The heater will keep blowing hot until, a while later, the heat is reduced. The same is true with the ac. Any change made with the temp control will not start for 5 minutes. Any ideas?
Jacob Wissler Jr., Houston, Texas, 1984 300 SD
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Old 10-02-2003, 11:19 AM
sixto's Avatar
smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
Check that the aspirator blower is working. It's the little fan attached to the main blower housing that sucks air through the cabin temp sensor by the rear view mirror. Check also the temperature-resistance values of the cabin temp sensor. The values are in the archives.

If it's only slow from hot to cold then check the seals in the monovalve cartridge.

95 S420
91 300SE
87 300SDL
83 300SD
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