C280's AC not cool - PeachParts Mercedes-Benz Forum

dondean · #1 07-19-2007, 09:25 PM

My 1997 C280's AC is not cool. The AC had been working intermittently. When the engine cool, the AC worked fine for awhile until engine warmed up, the AC clutch disengaged, then no more cool air. I just replaced new water pump. The freon is still full in AC system, not leaking. Any help will be appreciated.
Thanks.

slk230red · #2 07-19-2007, 09:35 PM

Quote:

Originally Posted by dondean

My 1997 C280's AC is not cool. The AC had been working intermittently for awhile. Now, the Ac clutch only engaged for a short while then disengaged, and cool air stop blowing out. I noticed there were some noises in water pump. I don't know if water pump defective could cause AC not working. The freon is still full in AC system, not leaking. Any help will be appreciated.
Thanks.

If you suspect you have a water pump problem I would fix that first, then move on to the A/C system.

forp · #3 07-19-2007, 11:23 PM

Search for evaporator temp sensor. Common failure and cheap/easy to fix.
Dan

dondean · #4 07-23-2007, 04:24 PM

Forp,
I listened to you to replace the evaporator temperature sensor located under dashboard driver side. It cost me $79 for part at dealer and $50 labor at some place esle. It seems working to me. The AC is cool again. But I have to keep it running for a week to make sure permanent fix. I appreciate your help a lot. Dallas TX in summer time is constantly 90s to 100s. For a mere $129 to fix AC, I will have a cool summer. Thanks to you.