AC Compressor Conundrum?
Thread Starter
Junior Member
Joined: Jul 2023
Posts: 68
Likes: 16
From: West Coast US
E350 (W212)
AC Compressor Conundrum?
Hello my friends from MBWorld,
I've had a 2014 E350 with a broken air conditioning system for some time now. I would like to narrow down the problem with your good help. I think it's just a bad AC compressor but here is what I know if anyone wants to throw in their ideas.
- AC Compressor clutch does not engage when AC is turned on
- Low side has higher pressures (75-100 PSI)
- Radiator fan works fine
I've always seen that there can be some AC relay or fuse but I never found any in any fuse box diagram so I could never really check, information about any AC relay or fuse is appreciated.
I appreciate any information anyone has to offer and please request any info you'd like,
Thanks
I've had a 2014 E350 with a broken air conditioning system for some time now. I would like to narrow down the problem with your good help. I think it's just a bad AC compressor but here is what I know if anyone wants to throw in their ideas.
- AC Compressor clutch does not engage when AC is turned on
- Low side has higher pressures (75-100 PSI)
- Radiator fan works fine
I've always seen that there can be some AC relay or fuse but I never found any in any fuse box diagram so I could never really check, information about any AC relay or fuse is appreciated.
I appreciate any information anyone has to offer and please request any info you'd like,
Thanks
Out Of Control!!
Joined: Apr 2019
Posts: 12,173
Likes: 6,883
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
check clutch circuit
Test the continuity of the clutch coil... these are known to get open.
Check that voltage/GND is present at clutch circuit.
Next step use a scanner to read the status of AAC controller.
Check that voltage/GND is present at clutch circuit.
Next step use a scanner to read the status of AAC controller.
MBWorld Fanatic!
Joined: May 2021
Posts: 2,528
Likes: 2,045
From: US
2008 E350, 2012 ML350, 2014 E350, 2015 ML350
If you do it with a MB-aware scanner, and the problem is the clutch, you should get something along what I described in https://mbworld.org/forums/e-class-w...ml#post8694515
@tvn858 and @Rulebraker followed some of the steps, and they also repaired their AC at a low cost, but some ^&*(@#$ words in between.
@tvn858 and @Rulebraker followed some of the steps, and they also repaired their AC at a low cost, but some ^&*(@#$ words in between.
Last edited by JCM_MB; Aug 14, 2023 at 04:41 PM.
Out Of Control!!
Joined: Apr 2019
Posts: 12,173
Likes: 6,883
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
no air 🫤
When A/C goes out is when you need a working sunroof. ✌️
Scan the car computers
test the compressor clutch
check voltage supply
....
get more ice-cream
Scan the car computers
test the compressor clutch
check voltage supply
....
get more ice-cream
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