G'day,
I have a 2010 E500/550 that is blowing hot air from the rear vents, it is a 3 zone system. I have read somewhere where a controller/component may be at fault, but I am blowed if I can find the post again now I have time to have a look. Have done various searches and gone through multiple pages but no luck so far. Can any one point me in the right direction?
Cheers
Could be temperature sensor, actuator motor, or rear operating unit best to have someone pull codes using Xentry (MB diagnostics) before replacing part(s).
This exemplify how many parts can cause the rear A/C issue you are experiencing.
You may want to listen or feel for the central console fan blowing air = good!
This is an easier problem with an easier fix than dealing with the main dashboard unit.
Thanks for replies. front is fine and A/C system was recently serviced with no other issues. My scanner, which I do not have huge amount of confidence in how deep it goes, did show a issue with front footwell thermistor being "faulty", which was the old broken wire when replacing the cabin filter trick which has now been repaired. There are no other AAC errors being picked up. The rear fan blows hard and speed can be controlled by the up /down buttons, just warm though. As per konigstiger I will get a "proper" scan done and see if that points towards the blend actuator, although as mentioned I am sure I read somewhere on the inter webs of a controller/component being a known culprit. Will update outcome.
Thanks for replies. front is fine and A/C system was recently serviced with no other issues. My scanner, which I do not have huge amount of confidence in how deep it goes, did show a issue with front footwell thermistor being "faulty", which was the old broken wire when replacing the cabin filter trick which has now been repaired. There are no other AAC errors being picked up. The rear fan blows hard and speed can be controlled by the up /down buttons, just warm though. As per konigstiger I will get a "proper" scan done and see if that points towards the blend actuator, although as mentioned I am sure I read somewhere on the inter webs of a controller/component being a known culprit. Will update outcome.
You're on the right track!
Rear fan blows good
Broken footwell sensor replaced
A/C serviced.
The blend door actuators are built with unsoldered electronics for limited reliability. Here it does look like they require additional service. There are 6 of 'em all identical...
FYI: you may have a bad actuator combined with zero fault
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Thanks S-Prihadi, that information is great and will give me enough info to probably dig a big hole for myself... and I am sure others will use it as well
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