Which is the high pressure line/service port and which is the low pressure lone/service port for the A/C. Can not find any info on how to differentiate. Need to add a can of refrigerant. Thanks for you help.

Submitted by mghirsch@netzero.net on Sun, 07/22/2007 - 10:52

The location depends on whether you have the V12 orthe I6. ON the V12, the low pressure fitting is by the right bank near the front of the engine. I don't know about the I6.

In any case, the low presure has a different size fitting than the high pressure. If you buy the filling hose with only one fitting to charge the system, you cannot make a mistake.

Maynard Hirsch
94 XJS V12 Coupe
86 XJ6
91 XJS (RIP)
78 MGB
67MGB

Submitted by david@daviddew.com on Sat, 07/21/2007 - 21:23

I am pretty sure the fitting will not allow you to put it in the wrong one, but nevertheless, the correct (low pressure) port is the one on the small "can" in the vicinity of the power steering reservoir. Due to a small leak in my condenser coil, I have become quite familiar with it. If you are leaking refrigrant, you might want to use the one with UV dye in it so you can find the leak.

David