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Old 04-16-2007, 03:35 PM
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Join Date: Aug 2006
Location: Houston, TX
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Question 140 Climate Control Questions

'92 300SE, as if I haven't already asked enough of these....

Today, get in the car after it has been in the sun for a while. Temp inside, I'd guess to be 85-90 degrees. A/C set at 75 both driver & passenger.

A/C comes on medium at best. I leave it there for about 3 or 4 minutes - no change at all. Cold air coming out center, left & right as expected, just no "urgency" to cool the cabin.

Press REST for 5+ seconds to activate sensor diagnostic mode - A/C immediately kicks into full cool-down mode. In-cabin temp sensor reports 85 degrees (confirming my original assumption.)

This behavior happens regularly - hot interior, no urgency of cooling from a capable system. Activate sensor diagnostic mode - BOOM - full cooling from then on.

What about the sensor diagnostic mode would cause the system to "wake up" and realize that more cooling is required?

Any suggestions? Last time I checked, which was recently, there weren't any stored trouble codes.

Thanks in advance.

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Old 04-17-2007, 08:01 AM
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Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Checking the command voltage from pushbutton to blower regulator would confirm where the problem is..

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