Join Date: Sep 2013
Location: Nant-y-moel, S Wales
Vehicle: 2001 R170 230K
Other Toys: 1953 BSA B31 motorcycle, Spirit TA kit car age unknown
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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.