AC Compressor Conundrum?
08-14-2023, 01:37 PM
#1
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Thread Starter
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
08-14-2023, 02:12 PM
#2
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MY'14 W212 M276 3.5NA @60kMi
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.
08-14-2023, 04:38 PM
#4
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2008 E350 (W211 @170K), 2012 ML350 (W166 @119K), 2014 E350 Sport (W212 @96K), 2015 ML350 (W166 @92K)
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 juanmor40; 08-14-2023 at 04:41 PM.
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08-16-2023, 09:36 PM
#6
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MY'14 W212 M276 3.5NA @60kMi
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
The following users liked this post:
juanmor40 (08-16-2023)
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