This is probably the very best upgrade you can make for your automatic climate control. It will switch the hot to cold or cold to hot much faster and will hold a much steadier heat at high engine speeds. The original heater valves are old and they are tired. Even the newest model is now 30 years old. If you own one of these cars, you might agree that your systems “works” most of the time but sometimes, not so good. In the past, you probably replaced the mono valve and things improved. At least you were getting hot when you wanted it and could turn it off when you desired. But now you find out that Bosch is no longer making the mono valve replacement and your system is acting up again. This valve is the HEART of the system. If it is damaged or not working properly then you will never get the heater to work right. Bosch monovalves and monovalve repair kits are now no longer available new. Many aftermarket rebuild kits are notorious for poor quality. Even after rebuilding, the OE Bosch monovalves tend to operate poorly at high RPMs and are prone to sticking. Klima Design Works BV Series valves are a new and superior replacement heater control valve system that uses technology from late-model vehicles.
Product Details
We include a bonus kit that will increase the longevity and performance of your system. Many don't realize there is a rotten deteriorated foam hose that has fallen off your center dash temperature sensor thus making the sensor "confused." Many also do not realize an overloaded aux. water pump can damage your climate control panel. Many don't realize the aux. water pump is not even working and can lead to poor heater performance. (It is better to remove it all together than to leave it installed when it won't pump! You will receive a replacement hose and fuse with complete video instructions.
WARNING: Keep in mind this valve may not fix all your heater issues. You must also have the following:
- 1. A good working auxiliary electric water pump ( replace or remove it from the system at best )
- 2. Non deteriorated temperature sensor foam hose under your dash ( replace it with our kit)
- 3. Good working heater blower motor
- 4. Properly functioning climate control push-button panel
- 5. Properly functioning temperature logic box ( located under dash behind glove box)
It may take some work on your part to troubleshoot additional problems with your system. Since it is the “heart” of the system replacing the monovalve is the best place to start. It is almost impossible to troubleshoot other problems unless you first know you have a good working valve assembly.
Here is a picture of it installed in a 1983 380SL.
If you want the best way to test your current monovalve or electrical water pump get our 12 volt power probe tester. See related products below:
We highly recommend you replace your old Bosch electric coolant pump with the newer Bosch pump used in many of the 1990 and early 2000 models. This pump will increase the reliability and performance of your climate control system. We off a complete conversion kit. See the related products below:
Related Products:
Multi Purpose Ultimate Wire Boot and Hose Clamping Tool
1981 to 1984 W123 Klima Heater Control Monovalve Conversion w/ Free Performance Upgrade Kit
Are you tired of your sluggish heater system? Does it take too long to change temperature. Does it get hot when you want it to get cold.
Late R107, Late W123 and All W126 Heater Mono Valve Repair Kit
This fits the U.S. models with automatic climate control which include the 1982 to 1989 R107 380SL, 500SL, and 560SL + the 1982 to 1985 W123 ALL models + the 1981 to 1991 W126 sedan and coupes. This is an easy fix that you can do yourself.
1981 to 1985 ACCIII Climate Control Performance Enhancement Kit
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.
Late W123 Bosch Electric Auxiliary Water Pump BYPASS Kit
Since the original style Bosch electric water pumps are no longer available NEW. If you need a replacement pump, you have three options. 1. Buy a used pump. 2. Buy our newer pump conversion upgrade. 3. Take your inoperable pump out of the system.
Early W126 Klima Heater Control Monovalve Conversion without Heated Windshield Washer Fluid Tank
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.
6 to 24 Volt Probing Electric Circuit Tester w/ Very Long Leads
With the long lead provided (12+ feet) you can hook up to your car battery and go around the car and test the operation of various electrical components.
1981 to 1991 Monovalve Climate Control Electric Water Pump Upgrade
Since the original style Bosch electric pumps are no longer available, Kent decided to come up with a good alternative.