I have a 1990 sl 500 with "No Heat". Heat was working one minute and not the next. Want to replace the ACC Mono Valve but dont know where to look for it on the 500sl . Have found instructions for just about every mercedes model but the 500. Any help would be appreciated.

 

[8D]check the fire wall between the windsheild near the battery or the check engine light self test button ,it should have the aux pumps for the heater dual hoseis under the valve.the mono valve have the repair kit that you just replace the top of the temp.valve.
if you got the new type they have the dual0-mono valve with the heater pump together.
the dual type the best is use the new one .dont buy the used one[X(] ...you'll be sorry!!!!!

 

where did you find the instruction for the other models please... I need one for c280 1996?

 

Here's the location of the monovalve.



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