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Rich WNY 06-21-2004 12:12 PM

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 ????

bobterry99 06-25-2004 12:52 AM

1 Attachment(s)
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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