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Old 01-16-2001, 04:32 PM
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Only three times in four months has this symptom occurred, but I'm wondering how serious it is.......The climate control in my 90 500SL will select full fan and full heat and won't relent, almost regardless of the temperature setting. I normally leave things in AUTOMATIC mode at about 70 degrees. I have to open the center "Cold" vent just to make things bearable. This has occurred in outside temperatures ranging from 25-40 degrees. Things seem to get back to normal operating mode the next time I use the car, which is often the next day.....Any ideas of the extent and expense of this problem???
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Old 01-16-2001, 06:51 PM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
Some of the malfunctioning problems of the climate control can be reset by the dealer!!
I had mine reset recently after my climate control (C250D)switched from Celsius to Fahrenheit (and back) several times and stopped opening any ventilation ducts besides the windshield ones. I couldn't regulate the airflow at all and the only thing I had to do was resetting the system.

Otherwise it can be a bad temp.sensor inside the car which detects a lower temperature as is and therefore activates the full power of the heating system.

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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Old 01-16-2001, 08:38 PM
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Join Date: Nov 1999
Location: Germany
Posts: 63
I'm afraid the problem with your 500SL is a little more serious than a "reset". I had the same problem and eventually had to have the aux water pump, a/c switch assembly and heater solenoid valve replaced. MB climate control systems often require a few dollars to fix, especially the older systems. "Mercedesshop" postings are full of similar problems, and similar solutions.

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