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Old 01-19-2003, 02:07 PM
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Join Date: Jan 2003
Posts: 22
1994 E420 A/C problem.....advise needed

I bought this car last July. The AC was freshly charged when I bought it and worked fine, but stopped working two weeks later. The MB dealer checked out the system and found nothing wrong; the system started to work again. I drove cross country to AZ, and everything worked well all through the 115 degree summer. I stopped using the AC in fall, but noticed that the system seemed to go on and off once in November when I used the AC (wasn't sure, since it was cool outside anyway). Now the system doesn't work again. I took it to the local dealer, who said I need a new evaporator and expansion valve.

Is there any other switch/control that could explain the AC problem apart from the expensive evaporator repair? I'm not sure this dealer spent any real time diagnosing the problem. I know the last dealer spent a good amount of time checking out the system and found nothing wrong then with the evaporator. Any advise would be greatly appreciated. Thanks.
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Old 01-19-2003, 04:08 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
An evaporator problem doesn't come and go. The problem they have is that they leak.

Find an independent that will do a florescent leak test. Have them find out if the system is low and then refill it and see how long it lasts and then find the leak for sure with a black light.

There are plenty of electrical reasons for the system to not function and then function. Not so with a leak.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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