Antifreeze/coolant - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 11-20-2013
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Antifreeze/coolant

Amazed a search didn't bring this up but anyway.. Not sure when my antifreeze was last changed so where do you drain it?
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#2 Old 11-20-2013
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Not sure if there's a proper drain point on the SLK, but what I've always done is disconnect the lowest coolant pipe, let it drain, reconnect, fill up.

After filling, leave the cover off the expansion tank, with engine running, squeeze every coolant pipe you can find to expel trapped air. Replace expansion tank cover when all air has been expelled.

BE VERY, VERY CAREFUL NOT TO CATCH HAIR, HANDS, FINGERS, OTHER BODY PARTS IN MOVING ENGINE PARTS (V BELTS ETC) WHILE DOING THIS.

I got away with a very slight injury to a finger last time I did it - edge of a belt cut the skin - could so easily have been a lost finger.
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#3 Old 11-20-2013
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Ok, here goes.Next post might be from hospital if i have one finger left!!! Cheers.
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#4 Old 11-20-2013
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On your SLK I think the coolant service interval is every three years. Starting in '03 the interval went to every 15 years or 150K miles. make sure you use a proper coolant. The typical green stuff is not approved. Measure the amount you drain out and compare that to the capacity and you can see if you've gotten most of it out. Flush it a few times with water and then a 50-50 mix of distilled water and the correct coolant.

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#5 Old 11-20-2013
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I havn't done it yet due to rain, but i wonder how important distilled water is compared to tap?
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#6 Old 11-20-2013
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Originally Posted by single View Post
I havn't done it yet due to rain, but i wonder how important distilled water is compared to tap?

That depend on how much and type stuff in your tap. I have seen tap water when boiled would leave a residue ring in a post. Not sure I would want that in my cooling system.


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#7 Old 11-22-2013
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Yeah for about two bucks worth of distilled water, I'd play it safe.

Len
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#8 Old 11-23-2013
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I recall changing the coolant on a Caterham 7 I used to own.

In order to ensure that the air was expelled properly, Caterham recommended raising the top of the radiator so that it was the highest point in the cooling system - while the engine was running to make the water pump work.

We had to use an engine hoist to lift the front of the car sufficiently.

Oh, how we laughed at what fun the manufacturer had made of maintaining it!
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#9 Old 11-26-2013
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There is a drain cock on the left side facing the engine. If you do not have the vehicle raised (not necessary to get to the drain cock) you can't really see it but you can feel it.
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