Left side A/C blowing hot air?

2001 MERCEDES BENZ S600
175,700 MILES • 5.8L • V12 • 2WD • AUTOMATIC
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RAMZITH1
  • MEMBER
  • 70 POSTS
My car A/C is working fine but suddenly the left side blows hot air and the right-side cold air. I tried to reset it and it's working fine but again blows left side hot air and right side cold air. please help, thanks.
Jul 2, 2023 at 11:12 AM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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Hi,

On vehicles, there are blend air doors also known as air mix doors. On most vehicles, the actuators for these doors are electric. On your vehicle, it is vacuum actuated. So, we may simply have a vacuum leak. Have you ever noticed if the temp is more likely to change when the engine is under a heavier load? Also, with the engine running, have you ever noticed a hissing sound?

I attached directions below for the replacement of the actuator. Check to see if there are any vacuum leaks to it. If there aren't, chances are it needs to be replaced.

Let me know if this helps or if you have questions.

Take care,

Joe

See pics below.
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Jul 2, 2023 at 9:44 PM
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RAMZITH1
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  • 70 POSTS
Hi,
Thanks, will do check and let you know.
Jul 3, 2023 at 7:21 AM