This vehicle uses R134A refrigerant and the connectors that it uses are not interchangeable or reversible(on the vehicle side). That doesn't mean you cannot screw it up, if you were to connect the hoses to the wrong side of your manifold set, but if you are using the auto parts store recharging line and little cans of R134A they will only connect to the low side port.
Coincidentally if you look up at the hood above where the low side port is you will see a sticker with the amount of regrigerant and oil that your particular vehicle uses. Mine has the rear AC so it uses 3.75 pounds of "freon."
The Villager does not have a test port, you need to tee into the line near the fuel filter to test pressure.
The Villager does not have a test port. You need to tee into the line at the fuel filter.
Under the dash to the right of the steering column.
Under the hood, right side, in low pressure line.
The OBDII diagnostic port is under the dash to the right of the steering column.
The Low Pressure Side port is located on the line coming from the the compressor. It can be identified by the black cap marked LOW.
Under the dash to the right of the steering column.
Freon is added to the lower pressure line port. It is the only port a refill kit will fit. I suggest taking it to a shop that does A/C repair if you do not know that already.
Through the low side A/C port.
directly below the steering wheel at the bottom of the dash
To add R-134a refrigerant to a 2000 Mercury Villager, first ensure the engine is off and locate the low-pressure service port, typically found on the larger diameter AC line. Remove the cap from the port, then connect an R-134a charging hose fitted with a gauge. Start the engine and turn the AC to the maximum setting; then, slowly add refrigerant while monitoring the pressure gauge to avoid overcharging. Once the desired pressure is achieved, disconnect the hose and replace the service port cap.
The AC port for recharging the air conditioning system on a 2001 Mercury Villager is typically located on the passenger side of the engine bay. Look for the low-pressure service port, which is usually situated on the larger diameter line connected to the AC compressor. It will have a plastic cap, often colored blue or black. Make sure to consult your vehicle's manual for specific details and safety instructions.