SL 500 R129 Air con woes
Discussion
Had my usual local garage re gas the aircon as the EC light remained on & check for leak. None detected although this is second regas in two years so compressor seal may be at fault?
Main Issue however is the control panel (post regas) now has a mind of its own in relation to the central dash vents which no longer blow air with the two little booster buttons permanently on, although sometimes the red one goes out if ignition is turned on and off.
Could this be an air lock in the vacuum pipes?
Cheers
blackchim said:
Had my usual local garage re gas the aircon as the EC light remained on & check for leak. None detected although this is second regas in two years so compressor seal may be at fault?
Main Issue however is the control panel (post regas) now has a mind of its own in relation to the central dash vents which no longer blow air with the two little booster buttons permanently on, although sometimes the red one goes out if ignition is turned on and off.
Could this be an air lock in the vacuum pipes?
Cheers
One thing these cars suffer from is the temperature senders fail, it's located behind the centre console and accessed via the passenger footwell. This causes the climate control to get confused as to the real temperature and stops blowing air through the vents. I'll dig out the part number in a bit.Main Issue however is the control panel (post regas) now has a mind of its own in relation to the central dash vents which no longer blow air with the two little booster buttons permanently on, although sometimes the red one goes out if ignition is turned on and off.
Could this be an air lock in the vacuum pipes?
Cheers
Part no. OE is MA210 830 07 72 and is known as an evaporator temperature sensor, I paid £52 for it which is probably madness but ran out of patience trying to find the manufacturer part no. (Bosch or Hella I think). You can get them in e-bay much cheaper but I didn't know what I would be buying.
Your issue may not be this but my car had symptoms similar to yours, however the fan would blow at the required speed for a short while on start up before getting confused and throttling back if you like.
Edited by truck71 on Saturday 24th October 12:43
What it actually is doing, is freezing the evaporator to the point it can't flow air, so the effect in the cabin is no airflow.
To test it while driving if this happens, press the ec button as if to turn off the a/c, and within ten minutes you may regain airflow.
If you do, it is the temp sensor which has failed, most likely due to water ingress, and it no longer knows the a/c is cold enough, so keeps the compressor active, overcooling the system until frozen.
To test it while driving if this happens, press the ec button as if to turn off the a/c, and within ten minutes you may regain airflow.
If you do, it is the temp sensor which has failed, most likely due to water ingress, and it no longer knows the a/c is cold enough, so keeps the compressor active, overcooling the system until frozen.
CarsOrBikes said:
What it actually is doing, is freezing the evaporator to the point it can't flow air, so the effect in the cabin is no airflow.
To test it while driving if this happens, press the ec button as if to turn off the a/c, and within ten minutes you may regain airflow.
If you do, it is the temp sensor which has failed, most likely due to water ingress, and it no longer knows the a/c is cold enough, so keeps the compressor active, overcooling the system until frozen.
So much better than my explanation.👍To test it while driving if this happens, press the ec button as if to turn off the a/c, and within ten minutes you may regain airflow.
If you do, it is the temp sensor which has failed, most likely due to water ingress, and it no longer knows the a/c is cold enough, so keeps the compressor active, overcooling the system until frozen.
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