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Old 07-31-2014, 06:31 PM
Join Date: Jun 2005
Location: Brooksville FL
Posts: 13
Schrader valve keep leaking

1990 300D, I have a reoccurring problem. The high side AC Schrader valve keep leaking. I have replaced with OEM MB valve core & started leaking again. This has been done 3 times & always starts leaking again. AC stops working after approx 2 months.
I have also used R134,retro fit on top of the R12 valve, now that's also leaking.
Any help would be great.

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Old 07-31-2014, 08:02 PM
Registered User
Join Date: Jan 2012
Posts: 7,515
A good valve cap with a o ring will seal pressure even with a bad core.

What method are you using to identify it is leaking?

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