How to Replace a Thermostat in a Mercedes V6 Engine 1998 to 2005 M112. This is another easy DIY job and something you should consider doing yourself to make sure it gets done right! If your car is taking a long time (longer than 5 minutes) for the heater to blow warm inside the car, that is often a good sign that the engine's coolant thermostat is worn out. Easy replacement and your engine will run healthier and your body will be happier. This video applies to C320, E320, ML320, CLK320, SLK320. It also indirectly applies to most V/8 engines M113 of that period as well.
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