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2000 E55, 2002 E320, 2001 E320
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17 Posts
Discussion Starter #1
Hi, when I was adding r134a to my air conditioner through the low pressure port I lost the cap. What size cap is it? I tried the cap from my Mazda but it did not fit. My local Autozone and Pep Boys say they don't carry the Mercedes size cap but I have a feeling they do, or I can find one online. Any help if much appreciated.
 

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1996 210.020
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The outside dimensions are standard, but I'm willing to believe that the threads are not all the same. I've never tried to use a different cap on my car.

In any case, I would not get any caps at big-box parts stores. They do not carry quality caps; the ones you buy will probably crack soon, and might even leak when new. Actually, they carry almost nothing of quality when it comes to AC parts.

Get one from the dealer. You'll be much happier in the end. Be sure to get the o-ring if it isn't included.
 
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