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Old 06-10-2003, 05:08 PM
NoVA Newbie MB
Posts: n/a
A/C Help

I have a '92 300SE (W140) and all of a sudden the A/C isn't working (it worked fine on saturday).

How do i determine if the Climate Control (small digital temp windows with push button selectors and a center dial for the fan apeed) or the compressor is the cause of the problem?

Thanks in advance.

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Old 06-10-2003, 05:10 PM
mike690003's Avatar
Registered User
Join Date: Apr 2003
Location: Miami,FL
Posts: 807
sounds like the dreaded w140 evaporator failure. Big $$.
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
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Keyless Entry
Monochromatic Paint (Custom Blue)
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custom "carbon fiber" console
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Old 06-11-2003, 12:58 AM
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Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
you have to elaborate on your problem to get
a specific reply.

Prayers bring forth enlightenment.
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Old 06-11-2003, 07:53 AM
Posts: n/a
I can't imagine a leaking evaporator causing the system to immediately stop cooling. A leak typically cools less and less over a period of time. There are about fifty different things that it could be besides a leaking evaporator.

Start by seeing if the clutch is kicked in. If it is, you need to connect gauges and check the pressures and look at the sight glass. If not, you need to check fuses, and trace the clutch circuit.

Good luck,

Last edited by LarryBible; 06-11-2003 at 08:02 AM.
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Old 06-11-2003, 10:27 AM
NoVA Newbie MB
Posts: n/a
Ok more info. The little red lights on the controls still illuminate and the air flow does move based on what selections are made. However, the air is hot and the clutch on the compressor is not turning.

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