Question about 1995 Mercedes-Benz S-Class

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I have S 350 TD Mercedes. When I adjust cabin temperature after 10 minutes start to blow warm air in cabin, sometimes on left side, sometimes on right side . What problem ca be? Thank you

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  • boris_velick Apr 05, 2011

    I have same problem if A/C is on or off, then I think this is not a problem with A/C.

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  • Master
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I am unsure with the S Class on the year you have if it uses a 'door' controlled by a solenoid to direct the air. It should be found around the center of the dashboard. Inconsistencies in the direction may be cause by a problem with the ducts or the 'door' or vanes that direct the air. Either the solenoid is starting to go bad or may have gone bad or the physical parts may have come loos are lost alignment. Inspect also the wiring and the terminals as it may lead to malfunction in the motor parts that control the air or temp sensors.

Posted on Apr 05, 2011

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  • Mercedes-Benz Master
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I'll assuming the the ac off light is lit on the climate control system. How to reset error codes to get the AC blowing cold again:

Start the engine
1. Hold the "Carbon filter" (lower left button drivers side) and the "Rest" button (upper left on the passenger side together until the display says "searching..."
2. It will show an error code or codes.
3. Press the "auto" button on the drivers side so make it "pop" out... do the same for the passenger side.
4. Press in the PASSENGER side "auto" button to make it press and stay in then do the same for the driver's side "auto" button.
This will clear the error codes for the AC .
Turn off the AC (press the "0" button) then press the AUTO fan button in the middle under the display and the AC should turn on and be cold.

Get the AC freon level checked. it should be between 1.6 and 2.0 lbs.

I always heard that the hot/cold problem was related to monovalves or duovalves (duo in this car).

This problem has been around for ages and this valve always seems to be the culprit. I remember changing a monovalve in my 1986 300SDL when I had the same problem..

I would suggest you look at the wiring to and from the duovalve, and make sure the thing is working correctly. I have heard of broken connectors and wiring causing problems like yours. I'm sure you can find the proper pinouts somewhere on the web, then use them to test the voltages at the duovalve to make sure it's being told to do the right thing.

Full freon but only cold air from center vents & the rest of the vents in the car hot. I thought it was duovalves problem too but after 4 visits to the dealer, they finally found that the cabin temperature sensor was bad. They replaced it & everything was fine.

Keep us updated.

Posted on Apr 05, 2011

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