Mercedes-Benz W204 C-Class Heater Valve Replacement

The heater valve shuts off the flow of coolant to the heater core to allow the engine to come up to temperature quicker on cold starts. If your heater valve has stopped working you can replace it without a lot of trouble but be prepared to work in a crowded area and do some things by feel. I have removed the intake manifold to get pictures of what you are going to be doing. You do not need to remove the manifold to replace the valve. It makes it easier but adds about 4 hours of work plus the cost of intake gaskets.

If you are going to be replacing the valve you might as well replace the coolant as well. If it is an emergency and you need to get the car right back on the road it is possible to remove the valve without draining the radiator. But you will loose all the fluid until the level gets even with the valve. I recommend doing it right and draining the coolant. Even with the coolant drained, you should expect a little spillage when removing the hoses, so be prepared for it.

Read the Full Article: https://www.pelicanparts.com/techarticles/Mercedes-W204/51-WATER-Heater_Valve_Replacement/51-WATER-Heater_Valve_Replacement.htm

Time: 1 hour
Tab: $100 to $150
Tools: T30 Torx:https://www.pelicanparts.com/Mercedes-Benz/catalog/tools/torx-sockets-bits.htm, flathead screwdriver:https://www.pelicanparts.com/Mercedes-Benz/catalog/tools/screwdrivers.htm
Applicable Models:
Mercedes-Benz C350 (2008-14)
Mercedes-Benz GLK350 (2010-14):https://www.pelicanparts.com/catalog/SuperCat/W204_catalog.htm
Parts Required: Heater valve:https://www.pelicanparts.com/cgi-bin/supertech/catalog.cgi?action=frameset&return-url=/cgi-bin/supertech/catalog.cgi%3Faction%3Dframeback%26page%3D3445&catalog-url=http%3A%2F%2Fwww.pelicanparts.com%2Fcatalog%2FSuperCat%2F4193%2FMBZ_4193_VENTHT_pg1.htm%23item3
Hot Tip: Replace the pump with the engine cold
Performance Gain: Working heat
Complementary Modification: Flush cooling system

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