How does the duovalve work on a hot water heater?
The duovalve is a 2×2 way bypass valve. When it’s energized, it bypasses the hot water back into the cooling circuit. When it’s idle, water circulates through the heater cores. The climate control system opens and closes each side of the valve on a variable duty cycle based on the temperature set on the display.
How can I Fix my duovalve ( W210 ) heater?
First, take a Torx T-10 driver and carefully remove the 5 screws holding the valve assembly together. Then, carefully remove the silver coil assembly. Finally, you can pull the two lower halves apart. Take care to not lose or damage the two small brass “umbrella” shaped valve poppets. These pictures show why the valve quit working.
What happens if the duovalve fails on a Mercedes Benz?
The Duovalve is used to regulate the amount of engine coolant that flows into the heater core between both sides of the passenger compartment. The Duovalve can fail in a few different ways. The upper electronic portion that holds the coils can develop an internal fault, rendering them inoperative.
What’s the best way to replace a duovalve?
Try to pry it up from the bottom of the Duovalve (yellow arrow), but use caution not to break the lower plastic housing. Press the metal tabs on the housing back inside (green arrows). This prepares the housing to accept the new Duovalve.
The duovalve is a 2×2 way bypass valve. When it’s energized, it bypasses the hot water back into the cooling circuit. When it’s idle, water circulates through the heater cores. The climate control system opens and closes each side of the valve on a variable duty cycle based on the temperature set on the display.
First, take a Torx T-10 driver and carefully remove the 5 screws holding the valve assembly together. Then, carefully remove the silver coil assembly. Finally, you can pull the two lower halves apart. Take care to not lose or damage the two small brass “umbrella” shaped valve poppets. These pictures show why the valve quit working.
How do you remove a duovalve air filter?
To remove the duovalve, first unlatch the top of the air filter housing and move it aside for better access to the hoses. Then remove the top spring clamp and hose. Next, push the top hose and the large rubber grommet out of the hole in front of the bulkhead.