Should be on one of the lined near compressor looks like tire valve. there will be one for high side and one for low (color coded blue usually) fill on low side
The 1988 Mercury Cougar diagnostic port can be found under the hood.
The 1999 Mercury Cougar OBD 2 port is under driver side dash left of steering column
You can find the 1997 Mercury Cougar low pressure port on top of the air conditioner compressor. The low pressure port will have a blue top.
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.
The 1999 Mercury Cougar OBD 2 port is under driver side dash left of steering column
The 2000 Mercury Cougar OBD 2 port is under driver side dash next to kick panel
The 2000 Mercury Cougar OBD 2 port is under driver side dash next to kick panel
The 2000 Mercury Cougar OBD 2 port is under driver side dash next to kick panel
At the low side port. If you do not know what this is, take it to a shop.
I have a 2003 Grand Prix GT and the AC recharge port is right behind the motor on the firewall. Look for the silver pipes coming out of the firewall right near the middle. You will see the recharge port on one of the pipes there.
The 1999 Mercury Cougar OBD 2 port is under driver side dash left of steering column