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Under the hood, right side, in low pressure line.
The Villager does not have a test port. You need to tee into the line at the fuel filter.
It is located near the right shock tower - the cap should be marked with an "L".
There are two ports on the air conditioning compressor on the Mercury Mountaineer. The refrigerant to recharge the system is to be connected to the lower port.
You can recharge your 1998 Mercury Mystique air conditioning system through the low pressure port. You can find the low pressure port on top of the air conditioning compressor.
Under the dash to the right of the steering column.
The Villager does not have a test port, you need to tee into the line near the fuel filter to test pressure.
At the low side port. If you do not know what this is, take it to a shop.
Through the low side A/C port.
Under the dash to the right of the steering column.
directly below the steering wheel at the bottom of the dash
I have a 2001, and the recharge port is on the passenger side, on the firewall. It's got a green cap on it and so far has been impossible to get to. Good luck.