M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Air conditioning issue

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Old Mar 5, 2016 | 06:18 AM
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ML350
Air conditioning issue

So over the last month, I've lost 99% of my aircon.
With the a/c button off, i get outside air.
With it on, it'll drop the temperature a couple of degrees at the vent, but not that cool on the face.
I thought maybe the gas was out, but had it checked and apparently it's fine.
I checked the fuses in the cabin and engine bay and all seem fine, although didn't check the relays.
The guy who checked the a/c gas, was pretty quick to diagnose that the compressor valve was faulty and would cost approx $1K to repair. (Not a MB specialist)
If in fact is the compressor valve, i read is fairly easy to replace, but no guide as to how to do it, any tips?
Anyone else have an idea what it could be?
Don't want to be replacing things that aren't faulty.
Thanks
Reply
Old Mar 6, 2016 | 09:03 PM
  #2  
ML350_guy's Avatar
Thread Starter
Newbie
 
Joined: Aug 2014
Posts: 9
Likes: 0
ML350
Anyone?

Originally Posted by ML350_guy
So over the last month, I've lost 99% of my aircon.
With the a/c button off, i get outside air.
With it on, it'll drop the temperature a couple of degrees at the vent, but not that cool on the face.
I thought maybe the gas was out, but had it checked and apparently it's fine.
I checked the fuses in the cabin and engine bay and all seem fine, although didn't check the relays.
The guy who checked the a/c gas, was pretty quick to diagnose that the compressor valve was faulty and would cost approx $1K to repair. (Not a MB specialist)
If in fact is the compressor valve, i read is fairly easy to replace, but no guide as to how to do it, any tips?
Anyone else have an idea what it could be?
Don't want to be replacing things that aren't faulty.
Thanks
Reply

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