Mercedes 107 123 126 Chassis Monovalve Heater Repair Kit with Instructions

FITS THE FOLLOWING: ALL 107, 123 and 126 chassis, both gas and diesel models from 1981-1991. This includes 300D 300TD 300SD 380SL 560SL and many more! Will NOT fit models before 1981 with the climate control servo.

PLEASE NOTE: JAN 2012 - Bosch is Currently sold out - we are offering the only brand available right now which is aftermarket made by MTC. It may not be as cosmetically perfect as the Bosch but is built to the same specs and it works just fine.

Having problems keeping consistent heat on in your Mercedes sedan or coupe? If the heat seems to come and go, or you are not getting any heat at all it probably is caused by a malfunctioning heater mono-valve. If the diaphragm in the mono valve is severely torn there is a possibility that you may be getting heat all the time. NOTE: It is possible to remove and inspect your existing monovalve by first draining approx one gallon of coolant out of the radiator, then removing the four screws holding on the cover plate. I have found in 80 - 85 percent of these cases a new mono valve fixes the problem. This quality repair kit is made by Bosch and is very easy to install yourself. If this item has not been replaced it is a good idea to do it anyway as a preventative measure. Do not let 15 - 20 year old rubber diaphragms fail before you lose your heat!

Includes picture installation instructions and troubleshooting tips. Only works on models and years specified.

Image below shows removing monovalve from its housing mounted on right side of firewall: