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Well, I assume you've got a grey market car since MB didn't import that model into the US, and most euro cars were fitted with A/C in the US. I'm not sure which A/C system you might have. I assume by your question, that you're looking to re-charge your system. There are two pipes coming out of the compressor. Rule of thumb, the fatter of the two pipes is usually the low side...another rule of thumb...its usually the one that is more accessible...usually on the top. If you haven't used the system for a while...you should check the clutch at the front of the A/C unit. Check the belts. Check the cyclops on the dryer when you have the A/C turned on and see what's going on there. And, depending the last time this unit was serviced, you should check with MB about the type of freone you can use. You might also need to have it flushed and oiled. If you plan on using the A/C this summer, it needs to be right...and an A/C service at the dealer might be worth it. If its a regular service, it should be inexpensive...its only if and when they find any problems with the system, that it could cost you some money. Hope this helps.

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