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Old 06-21-2004, 12:12 PM
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Join Date: Jun 2004
Location: lockport, new york
Posts: 4
1990 500sl NO HEAT

No heat in 1990 500sl , one minute working - next its not. Want to replace the inexpensive $85.00 acc mono valve before i replace the $500.00 climate control unit. Dont know where to look for the mono valve on the 500sl. have come across instructions on just about every other Mercedes model but the 500sl . Any help would be apprectated. Heater hoses are buried cant locate. I'm sure it somewhere near firewall ????

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Old 06-25-2004, 12:52 AM
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Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 670
If your car was manufactured in 1990, you ought to run diagnostics on the controller as explained here. The monovalve is shown below.
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1990  500sl NO HEAT-delete.jpg  

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