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Old 08-13-2006, 07:46 PM
Registered User
Join Date: Jun 2004
Location: Toronto, Canada
Posts: 27
300E A\C runs Continuously

A\c seems to work well. When increasing cabin temp with the temperature control, the heat works properly. The problem is that the compressor clutch appears to be working continuously without declutching. What might be the problem?

Walter Sawczak
1990 300 E
1993 Lincoln Mark VIII
1983 Jaguar XJ6
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Old 08-13-2006, 08:00 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The AC clutch is automatically controlled to a preset evaporator temp. The act of changing the inside chosen temp has nothing to do with this unless one chooses the 'EC" position.

The act of changing the temp is accomplished by mixing airconditioned air with heated air unless one chooses "EC".
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 08-13-2006, 09:22 PM
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,538
Just to add a little bit more to what Steve posted:

If you have any button on the HVAC panel pressed other than the EC button, the a/c is always "on". It functions this way by design

On W124 cars, it is best to not set the wheel in the fully hot or fully cold position, and also to not set the fan blower speed to continuously on "high" or "low", but rather use the "Auto" button.

Drivers have the feeling that full heat or full A/C will get the passenger compartment to the correct temperature fastest.

This doesn't allow the system to work as designed.

To get the longest life from the automatic climate control system, allow the system to exercise all components.

If the temperature inside the car is more than 4 degrees away from the setting on the temperature wheel, the system will use full heat or full A/C regardless.

As the interior temperature approaches the setting at the climate control panel, the automatic functions will slowly reduce blower speed.

Allowing the system to work in its automatic mode, with all components functioning, will prolong the life of the system.

When flap controllers and valves (vacum operated) don't move for long periods, they tend to stick in position and ruin the component.

Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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