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Old 02-20-2001, 08:26 PM
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Join Date: Sep 1999
Location: USA
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When the heat is on full, with thermosat wheel all red, the air condtioner compressor still cycles on and off, is this normal?

Thanks for all answers.
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Old 02-20-2001, 08:41 PM
Ali Al-Chalabi's Avatar
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Location: Knoxville, TN
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is this with the climate control in economy mode?
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Old 02-20-2001, 08:43 PM
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Join Date: Sep 1999
Location: USA
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Hi Ali:

The compressor stays off in the EC mode.

The cycling condition I describe above is when the center "normAL" button is engaged.
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Old 02-21-2001, 12:41 AM
Ali Al-Chalabi's Avatar
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Location: Knoxville, TN
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I believe this condition is normal. The economy mode is there to ensure that the compressor does not run. I always use economy when I have the heat on.
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Old 02-21-2001, 06:34 PM
Join Date: Aug 2000
Location: Holland, MI
Posts: 1,316
Cycling the A/C compressor with the heat on may not make sense at first; why would you COOL air you are trying to heat?

In some cars de-fogging a windshield in a downpour is impossible until you set the fan to Hurricane and the temperature to Bake.

My Suburban and a lot of other cars automatically engage the A/C when the Defrost button is pushed, even if the A/C button isn't pressed.

A true climate control systems will DRY the air and then regulate its temperature. This is the difference between true air "conditioning" and just heating and cooling.

First they cool the air to remove humidity, and then re-heat it to the desired temperature. In the summer this makes cool air feel less "clammy." In cool, damp weather it clears window fogging quickly.

There usually is an ambient temperature cut-out switch that keeps the compressor from running at or below freezing temperatures, when it won't do any good anyway.

Enjoy the benefits of your MB's true climate control system!

BCingU, Jim
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