Well its getting a little chilly in So Cal.. ( yea i know its not compared to the east) but my heater in my SD is not running..

for example when the defrost button is pressed.. the blower works.. i feel cold air running in.. but thats about it .. cold air..

sometimes.. when im @ a stoplight and i try it i get a little warm air for a couple of seconds.. but then the rest is cold..

in addtion when the regular buttons are depressed sometimes the air continues to come in via the defrost vents?.. any ideas on what the problem could be?? are both problems connected in some way?
thanks

Had a similar problem. My heat stopped at 62mph and came back on as I went slower. Replacing a the mono valve ($30-40)is simple and worked for me as well as several others on this forum.

Do a search on "mono valve" and "climate control" and you will get a lot of info.

MOno valve is on the wall next to the battery to the left of the engine (looking at it). Four screw (don't drop them) is all you need.

I got one for free at a salvage yard as I was strapped for cash, but I would go new if I could have.



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81 300D 250K+ (odo doesn't work!)
Want another one.