Heater Hose Replacement - C Class - W204 - Mercedes-Benz

Heater Hose Replacement Time: 1 hour Tab: $100 to $150 Talent: 3 Tools: Flathead screwdriver, pliers Applicable Models: Mercedes-Benz C350 (2008-14) Mercedes-Benz GLK350 (2010-14) Parts Required: Heater höse Hot Tip: Work on a cold car Performance Gain: Working heat Complementary Modification: Flush cooling system There are two heater hoses hoses on the Mercedes-Benz C350 and both can fail over time. I recommend inspecting your rubber hoses every two years or so. As they age, they have a tendency to get hard and brittle. When you gently squeeze a hose, it should be relatively soft and easy to indent with your hand. It shouldn't feel like it is brittle or crunching when you squeeze it. It should spring back to its original shape pretty quickly after being compressed. If it feels very hard, then it might be time to replace it. If there is a bulge in the hose, or any type of crack in the surface of the hose, then you should replace it as well. Also check for leaks around where the hoses create their connections--that is a sign that the hose should be replaced. One hose is located on the front right side of the engine bay, while the other is at the left rear of the engine. Due to the level of the hoses I recommend draining the fluid before you replace the hose. If the coolant is still good drain it into a clean container and reuse it. If the coolant is old now is a good time to give the system a complete flush. Please see our article on draining and flushing your coolant. Replace leaking heater hoses with help from this article Applies to: C350 (2007-14), SLK350 (2004-14), CLS350 (2004-14), CLK350 (2005-14), E350 (2005-14), S350 (2005-14), SL350 (2005-14), R350 (2006-14), ML350 (2006-14), Viano (2005-14), Sprinter (2006-14), CLC350 (2008-14), GLK350 (2008-12)