I have '81 380SL. The problem started about three months ago when the
heater quit working. Recently, the heater control valve began leaking
coolant. Going through all (and I do mean all) the MB parts web sites, the
only part available for this heater control valve unit is something called
"mono valve repair kit" which I have ordered/recieved. That repair part is a
slug with some seals on it that is obviously intended for some sort of
solenoid valve. Upon removal and disassembly of the heater control valve, I
discovered that the plastic body of the valve (the portion which has various
chambers for coolant) was fractured and that fracture was the cause of the
leakage. The thing which is of real concern is that the heater control valve
I have does not utilize a solenoid at all, but rather uses a rather
elaborate motor/gear/vacuum system - i.e. no solenoid slug anywhere inside.
Now my "real" problem........If I order up a replacement heater control
valve for this car, knowing that a "repair kit" part supposedly for this car
is not used in this unit, how do I know what heater valve to order?????
Anyone have a set of the repair Cd's for this MB that they want to sell?