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Hi,
From where does it leak? From the Schraeder valve insert? From the O ring at valve base? Or from the black plastic cap screwed over the valve (the one that has "6Nm" wording on it)?
Most AC valves are supposed to work WITH cap on it. The Schraeder valve insert alone couldn't withstand the refrigerant pressure. There's a yellow O ring outside on Volvo's valve body which is supposed to act as SECONDARY seal when its black plastic cap is screwed on (PRIMARY seal is provided by the Schraeder insert). This O ring could have been flattened by now. Replace with new one (R134a compatible O ring). Lubricate a bit with refrigerant oil or Nylog blue before screwing back the valve cap.
If you've lost your valve cap then try to find it back. Its precious. If it was lost at the AC shop ask them to find it back. Volvo's valve cap is the best as it comes with inside metal thread which could be tightened more compared to generic replacement caps. And it works perfectly with the valve body. Once my valve cap fell into a hole on the car's body frame during my AC work. I ordered and tried generic caps but some these seal poorly. Tried a few of them until finally got one with proper seal. Finally I fished back my fallen valve cap because replacements are not as good.
Temporary replacement caps could be obtained from the web. Go to:
http://www.shopcenturyautoair.com/store/c16/Service_Items_and_Kits.html
Volvo's valve cap comes as part of the valve body set. You could try your luck from ebay (sometimes its there) or finally order from Sweden.
Regards,
Amarin.
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