Coolant Expansion Tank Replacement - C Class - W204 - Mercedes-Benz



Coolant Expansion Tank Replacement - C Class - W204 - Mercedes-Benz


Coolant Expansion Tank Replacement Time: 1 hour Tab: $35 to $70 Talent: 2 Tools: Pliers, screwdriver Applicable Models: Mercedes-Benz C350 (2008-14) Mercedes-Benz GLK350 (2010-14) Parts Required: New expansion tank, coolant Hot Tip: Replace the tank with the engine COLD Performance Gain: A major cooling system leak fixed Complementary Modification: Flush cooling system Over time, the coolant expansion tank tends to turn yellow with age, become brittle forming micro fractures and sometimes leak. When the car warms up, both the heat and pressure of the coolant starts to attack the weakest point of the tank, eventually causing it to fail and the car starts leaking coolant. The good news is that the replacement tank is relatively inexpensive and can be changed in less than an hour. Take a look around the coolant tank. In some instances, you can instantly see it has been leaking. In others, you may only see a faint trace of coolant weeping/staining the crack or seam. It's important to tackle this problem as soon as possible. Warning: Failure to repair or replace a leaking cooling system component can potentially cause a catastrophic failure damaging the engine. In our tank it was obvious as the overflow hose nipple broke off. A couple of safety precautions/instructions you will want to observe before beginning include: allow the cooling system to cool down to a coolant temperature of less than 90 degrees C; open the cap of the cooling system slowly. Turn a conventional coolant cap as far as the first detent and turn a screwed coolant cap approx. 1/2 turn and release the pressure. Wear protective gloves, protective clothing and eye protection. NEVER pour coolant into beverage bottles, cups, etc. Someone might accidentally pick that cup up and start to drink. New coolant technology means that coolants can last a very long time now. If your coolant is good there is no need to drain the system to replace the expansion tank. If you coolant is failing now would be a really good time to drain and flush the system. Please see our other article on this procedure for additional assistance. Coolant expansion tanks get old and leak. Keep your engine compartment clean and dry with a new overflow tank. 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)

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