SL/R129: 94 500SL my A/C quit
Thread Starter
Newbie
Joined: Nov 2009
Posts: 3
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From: Pittsburgh, Pennsylvania
'94 500SL
94 500SL my A/C quit
My 95 SL500 A/C quit working ? The compressor will engage for a second & then disengage ? What can I do to diagnose & fix the problem ? I only drive it in the summer, so A/C is a must. The car has 64K miles.
Any help, would be greatly appreciated.
Thanks in advance.
Any help, would be greatly appreciated.
Thanks in advance.
Member
Joined: Jul 2008
Posts: 213
Likes: 31
From: SW Florida
1995 SL500 - 2017 AMG GLC 43
Sounds like it's low on Freon. Add some Freon with leak detect dye to determine if you have a leak. I just replaced the compressor on my 95 due to a leak at the front seal on the compressor.
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Joined: Jan 2006
Posts: 1,982
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From: Atlanta, unfortunately
'09 S600, (2) R129 300SLs, '03 SL500, '03 SL55
If it literally cuts-out after a second, then I would suspect a problem with the clutch control.
The MAS module powers the compressor clutch. It also monitors compressor RPMs. To protect the serpentine belt in the event that the compressor has frozen, upon engaging the clutch the MAS must see the compressor spinning, or it will block operation of the clutch until the ignition key is cycled.
You can tell if the MAS is blocking operation by reading its codes as explained here: http://www.benzworld.org/forums/r129...ml#post1925941
The MAS module powers the compressor clutch. It also monitors compressor RPMs. To protect the serpentine belt in the event that the compressor has frozen, upon engaging the clutch the MAS must see the compressor spinning, or it will block operation of the clutch until the ignition key is cycled.
You can tell if the MAS is blocking operation by reading its codes as explained here: http://www.benzworld.org/forums/r129...ml#post1925941
