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Old 04-11-2003, 08:58 AM
hocky1 hocky1 is offline
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Join Date: Jun 2002
Location: Melbourne, Australia
Posts: 80
Question black cylinder with twist knob on top

This item sits on top of the aircon compressor under the hood. It has a twist knob on top of it with a 2way arrow. To be exact, it is next to the oil filter cylinder. My car is the 1994 C180 Euro. What is this item? What will happen if I start to twist the top knob either clockwise or anticlockwise? I thought this was only in the diesels, maybe there is another lookalike in the diesels.
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