Mercedes® Heater (HVAC) Mono Control Valve Repair Kit, With Insert, 1981-1991

If the heat seems to come and go in your Mercedes, or you are not getting any heat at all it probably is caused by a malfunctioning heater mono control valve. If the diaphragm in the mono valve is severely torn or worn by age, there is a possibility that you may be getting heat all the time. We have found that 85% of the time a new mono valve repair kit will fix the problem. This quality repair kit is very easy to install yourself and is a good idea to do it anyway as a preventative measure.