I have recently purchased a 1992 Sedan Deville with the 4.9 motor. I love the car. Runs great except for one problem.I have a no heat coming out from the drivers side. Passenger side is fine. Same problem with defrost also. I have checked all the vacuum actuators and they seem to be working. However there is a vacuum line coming off of one actuator that I cant see where it goes to. The motor that controls the heat seems to working ok also. That is the one you can see when you take the glove box out. These cars dont have 2 heater cores do they? It looks like there is 2 return hoses from the heater core area that go to the thermostat housing. Any help would be greatly appreciated as my feet get cold while driving LOL

 

I don't have any heat on the drivers side of my 1993 400SEL, in all modes and temps. (auto, defog, manual high setting) just cold air. I have tried EC on/off and recirc with no success. I have good air flow on both sides and windshield. The heat works on the passenger side. I have checked fuses and they are good. Any ideas? Is this a Duovalve/Monovalve problem? Are there any relays to check?


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