Question about 2000 Mercedes-Benz CLK

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AC blown warm air

In the morning the air is cold, and comfortable, as it reached afternoon the AC blow cool and then warm air, my thermostat had been set for 72 for 3 yrs, for some reason no matter what temp I set it kept go right back to the this temp.. this time, it no longer maintainced 72 but blow warm air after 5 minutes of cool air.. I had my system filled with Freon a week ago, it worked fine for 4 days...they also have a special dye injected to the system so that this time could detect the leak since it can only be seen by flourescence light.. I am a bit skeptical about the problem,
1) why thermostatt kept go back to 72?
2) and is there a leak or maybe more?

Pls help me with your expertise , at least I knew what to look forward to as I approach the service dealer .. thank you so much ,, K

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This one is a difficult one to say. You could have a bad ac unit on the cars engine. Also when it goes back to 72 degrees your car is just displaying the temperature inside the car one of the features of a digital adjustments on these types of cars. Also you could have a leak and therefore not getting the cold air you wanted.

Posted on Jun 17, 2009

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