Air Conditioner Intermittently Blows Hot - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 06-12-2009, 06:38 AM Thread Starter
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Air Conditioner Intermittently Blows Hot

Occasionally on my 2005 SLK 350, my AC starts blowing hot air. It only lasts for about 30 seconds, then cold air resumes. It happens 2-3 times every day. The dealer has had it twice, but can't duplicate the problem. Does anyone have any suggestions?
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post #2 of 3 (permalink) Old 06-12-2009, 06:48 AM
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If it does it in auto mode, maybe your interior temp sensors are dirty & it issending a wrong reading to te compressors to turn on & off. Try cleaning with a vacuum cleaner. In my car I have 2 sensors, one by the int. rear view mirror & the other on the HVAC control pad. Hope this works.
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post #3 of 3 (permalink) Old 06-12-2009, 12:01 PM
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Plus one. Also check/replace your cabin filters, if they're dirty that can result in an inefficiency and inaccurate readings, as well as erratic behavior and shorter blower motor life.

Take care and enjoy the ride,

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