beyond naive - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 01-29-2007, 06:54 PM Thread Starter
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beyond naive

where in the hell is the water pump located on the c230's?
how often do you add water?
do you need to add anti freeze with the water?
could check light be an indicator that yyou need to add water?
my light is on and the heater gauge is at 85.
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post #2 of 3 (permalink) Old 01-29-2007, 10:33 PM
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The water pump is at the engine bay :-) Seriously, are you after the main engine water pump? It is driven by the poly belt, you should be able to identify each equipment driven by the belt, one of them the water pump.

I never add water on my cars (know on wood). There is a fault if you need to add water.

You have to add antifreeze even if you were from Arizona, and you have to use the exact correct type of antifreeze (normally identified by color but I would check from a dealer). The antifreeze additives are important even if there is no risk for freezing.

If the coolant warning light is on, there is an issue that needs to be fixed, even if it was only the coolant warning light switch broken and no water leak at all.

What is your car mileage? Perhaps the water pump is leaking, they have a limited life time and aren't that expensive to fix.
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post #3 of 3 (permalink) Old 01-29-2007, 10:48 PM
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You need to supply more information to get a reasonable answer. Over the years the C230 had a 2.3 I4 with injected and supercharged versions, a 1.8 I4 that was supercharged and most recently a 2.5 V6, and this just covers North American versions. People from all over the world exchange information here so you can't assume that your C230 question would be common or apply to the same car that other members might have.

Generally, Mercedes has a closed cooling system. If the coolent level drops you need to find the leak before doing anything else. Leaking systems don't hold pressure and also may allow air into the system. If air gets into the system it will provide another vector for corrosion to occur between the dissimiler metals used in the construction of your engine and other componets linked to the coolent. The best place to add and check coolent is the coolent expansion tank. It is translucent plastic with a black plastic tank top. It has a pressure holding cap on it but it doesn't resemble old fashioned radiator caps. Here is a picture of where it might be on an 06 with the 2.5 V6:

Checking the coolant level

(1) Expansion tank
(2) Cap

Slowly turn cap by half a turn anti-clockwise to allow excess pressure to escape.

Turn cap further anti-clockwise and remove it.

There is sufficient coolant in expansion tank if the coolant is level with marker bar in the filler neck when cold or approximately 1.5 cm higher when hot.

Top up the coolant if necessary.

Replace cap and tighten it until it clicks into place.
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