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#1
03-18-2010, 04:06 PM
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96 e300d a/c problem
Hi Guys
My a/c compressor wont come on and the ec button light wont turn off. I ran a 12v hot wire to the compressor it turns on the car get cold but the light stays on. The system needed 2 cans of 134a. Whats my next step? Thanks Greg 
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#2
03-18-2010, 04:41 PM
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There are diagnostics that you can run with the climate control pushbuttons. Use the search function to find them on this forum.
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#3
03-18-2010, 08:00 PM
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Almost certainly your pushbutton unit has a stored code for low refrigerant, which will cause the EC lamp to stay on and the compressor to stay off. Now you will probably also have a code for a bad electromagnetic clutch due to disconnecting the wire, so you can ignore that code when you read them.
Did you ensure that you had positive pressure in the system before adding refrigerant? If so, you should have it sniffed for leaks. If not, or there was no pressure, the dryer should be replaced also.
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#4
03-19-2010, 02:37 PM
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96 e300d a/c problem
Hi Guys
Thanks for the reply. How do you clear the error codes on the control unit? If the belt slips will this cause the compressor not to come on ? Could the ec button be bad causing to stay on ? Thanks Greg
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#5
03-19-2010, 07:44 PM
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Unlike older cars, there is no compressor speed signal. Thus, a belt slip will not directly disable the compressor, for example when the belt gets wet. However, if the compressor locks up, the belt will slip very badly and will blow the (non-replaceable) thermal fuse in the clutch.
Search for the procedure to extract the codes. The last step is to clear them. If you didn't clear any codes yet, don't suspect anything else until you do. Be sure to write them down.
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#6
03-20-2010, 12:03 AM
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__________________
Jake 1999 e300d PlantDrive WVO/SVO conversion **note to self: oil changed at 268k kms** 1990 Toyota 4Runner FrankenDiesel swap
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