A/c help
Thread Starter
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Joined: Oct 2020
Posts: 5
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ml350
A/c help
Ml350 2008.
wasnt cooling efficiently, and the electric fan had been running very high.
my researched pointed to the pressure sensor switch.
prior I checked the Freon and it seemed to by fine.
I replaced the switch,
evacuated the system and checked for leaks.
and it is perfect.
I fired it up turned on the ac
took the 1st charge with no issues,pressure was only at 30.
I connected the 2nd can the pressure shot up
to 70lbs red zone on my gauge..
I connected a 2nd gauge to confirm.
what I noticed is when the fan kicked on that’s when the pressure shot up.
the air is blowing hot, so it needs more charge.
any thoughts?
wasnt cooling efficiently, and the electric fan had been running very high.
my researched pointed to the pressure sensor switch.
prior I checked the Freon and it seemed to by fine.
I replaced the switch,
evacuated the system and checked for leaks.
and it is perfect.
I fired it up turned on the ac
took the 1st charge with no issues,pressure was only at 30.
I connected the 2nd can the pressure shot up
to 70lbs red zone on my gauge..
I connected a 2nd gauge to confirm.
what I noticed is when the fan kicked on that’s when the pressure shot up.
the air is blowing hot, so it needs more charge.
any thoughts?
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
So you replaced the Pressure Sensor (not a switch) on your research and that didn't fix the problem.
The cooling fan will run at high speed once the A/C Control Module recognizes a problem, and will prevent the compressor to actuate.
What you should have done originally, was check for codes in the AC system.
The cooling fan will run at high speed once the A/C Control Module recognizes a problem, and will prevent the compressor to actuate.
What you should have done originally, was check for codes in the AC system.
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Thread Starter
Newbie
Joined: Oct 2020
Posts: 5
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ml350
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