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Here is a comprehensive check list of what and where to check for trouble in your heating and cooling system. Learn how to inspect functionality of interior heat sensor, mono valve, CCU climate control unit, interior temp sensor blower, and the auxiliary cooling water pump.
In the video you will also find the part number of the correct MB mono valve insert A0008350644. Do not use the cheap online replacements - they simply do not work correctly.
In the event you have a genuine mono valve that no longer works, there is now a repair kit that helps you replace the rubber parts. Here is the link: www.pelicanparts.com/More_Inf...
The following genuine BMW mono valve insert is identical to the Benz part A0008350644: Genuine BMW E24 E28 E32 E34 Mono Valve Heater Solenoid Valve OEM part number 64118390132. It costs a pretty Penny, but this has a greater chance fixing your erratic heat issues than buying the cheap online parts store inserts.
Update: This part number now also no longer seems to be available.
The controller part number that was used here is 126-830-05-85.