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On Demand Video
Mercedes Monovalve Installation - On Demand Video

Monovalve Heater Control Inspection - Installation - Testing - On Demand Video Manual

Covers 1981 to 1991 W123 W107 and W126 with automatic climate control panel

If you have a 1981 to 1985 W123 300D, 300CD, 280E, 280CE, 300TD or a 1981 to 1989 W107 380SL, 560SL, or a 1981 to 1991 W126 380SE/L 300SD 500SE/L 300SDL 420SE/L 300SE/L 560SE/L 380SEC 560SEC that has automatic climate control this video manual will apply. These c


126 Heater and A/C Motor Repair Manual - by Kent Bergsma

Fits all Mercedes 126 chassis cars from 1981 to 1991. This includes the 300SD, 380SE, 380SEL, 500SE, 500SEL, 300SDL, 420SEL, 560SEL, 300SE, 300SEL, 380SEC, 500SEC, 560SEC.

This repair guide will take you through the process of how to properly remove your heater blower motor and replace the motors two brushes. This is the most common reason for failure. 


W126 Chassis New Heater Blower Motor Assembly

aftermarket part

New heater blower motor assembly with fan and housing. Installation is very easy once you get that pesky under dash panel off on the right side. We do include instructions for that but not for the actual removal of the motor. You will see the 8mm attachment bolts.

On Demand Video

1981 to 1991 Monovalve Climate Control Electric Water Pump Upgrade Installation Instructions - On Demand Video

How to install a newer style pump in your late W123, late R107 and W126 with ACCIII automatic climate control

In this 30-minute instructional video, Kent will explain how this new pump compares to the original, what is included in the kit and why, how to make a new plugin wiring harness, demonstrate step by step how to install this pump in a late W123 and explain the differences you will face when instal


Early W126 Klima Heater Control Monovalve Conversion without Heated Windshield Washer Fluid Tank

Free Performance Kit Included. For most 126 sedans and coupes 1981 through 1985. Replaces the original Bosch valve on ACCIII U.S. Automatic Climate Control cars - Limited Stock

PLEASE NOTE In stock now and ready to ship. No detailed instructions at this time, but it is not a difficult install this unit once you remove the false firewall at the back of the engine. You will be able to gain access to the monovalve and electric pump assembly.


1981 to 1985 ACCIII Climate Control Performance Enhancement Kit

Must do for 1981 to 1985 W123, W126 and R107 with automatic climate control. You won't believe what you find under your dash!!!

The parts in this little kit will do two things.  1. Protect your climate control push button panel. 2. The system will get more accurate readings from the climate control sensor on top of your dash.


W116 R107 W123 W126 Auxilary Water Pump Heating System

This small aux electric heater pump is no longer available new - When it quits working it causes restriction in hot water flow

Good used pump as shown. Has been tested. Runs smoothly and does not leak. This fits models only with automatic climate control (push button panel.) It is very important you test this pump by unplugging and applying 12-volt power.


Engine Coolant Temperature Sensor

SINGLE pin - located on left side of cylinder head by glow plugs on 1977 to 1985 OM616 and OM617 Diesel engines.

New coolant temperature sensor for most Mercedes built from 1973 to 1993, Gasoline and Diesel models. Many gas models it is located on top of the thermostat housing. Sends signal to engine coolant temperature gauge on the dashboard. These are getting harder to get. Single pin


W126 300SD Monovalve Housing, Electric Aux Pump, Bracket and Hoses - USED

Good working condition. Fits 1981 to 1985 126 300SD and 380SE / L

Good used monovalve housing and hoses as shown. One hose is missing. Electric pump runs smoothly and these are no longer available. Good pump bracket. Mono valve switch assembly and plunger is NOT INCLUDED. SEE RELATED PRODUCTS below to order separately.


Late 123 107 126 Monovalve Heater Switch Valve Solenoid Used

Will need replacement rubber diaphragm. Solenoid works good. Original Mercedes valve

For heat control on the late W123, 107 380SL 560SL 1982-1991 and W126 1981 to 1991. Good used mono-valve switch solenoid. When this goes bad the valve will not operate and if it shorts and gets overheated then a new valve will not fit into the solenoid housing.