Recently purchased my 2014 XF 3.0 and I have noticed that the high side (upper) air conditioning service port cap is missing. Having several new caps from previous cars laying around my garage I attempted to find one that would fit, but none of the 5 or 6 I tried was large enough. I have searched around the internet and looked at the Jaguar parts diagrams and cannot find what size/type of cap that I need or where to purchase one. If someone has any idea of the size I would greatly appreciate the help.

 

That's strange because AC fittings are are all standardized?
I assume you know the high side is a smaller diameter than the low side fittings?
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Thanks for the reply...I ended up taking a chance on a kit from Autozone and the caps fit. None of the red high side 16mm caps I tried would screw on, they were too small inside. I think that port is considered "large bore" and requires a comparable cap. As for the sizes of lines, the high side lines service port is larger (16 mm) than the low side port (13mm) on 134a systems.