Posted on May 05, 2010

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I have a 1992 mercedes 200 E WDB 021 Saloon, it has 8 button air condition and I dont know how to use it. Control wheel on blue position but When I push the button (leftmost)which has a glass figure on it, air condition motor is working but hot air is coming in to car. On blue position why it is heating the air? I take the control wheel red, except EC button When I push the other buttons (arrow down and arrow up) air condition motors is still working. I dont understand Why air condition motor is still working on red position, is my air condition's control relay contact dameged? Please help me, can I find user manual of air condition?

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Jason Johnson

Mercedes-Benz Master 1,619 Answers
Posted on May 05, 2010

Jason Johnson

Mercedes-Benz Master

Joined: Jun 15, 2009

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The pulley on the air condition has to turn it has a belt on it. The Compressor engages to pre cool the evaporator. Most likely you have a blend door pod leak or leak in the hose or the sampler valve is bad. I would replace the sampling valve behind the glove box/air bag. As that reads the cabin temp and if it thinks the car is cold the heat will stay on because everything is automatic. All vents will blow cold when it thinks its hot and in addition to floor and corner dash center vents will blow cold when it works. If the direction of air is correct then the A/C system may have a leak or need a charge of freon.

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