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.
Since the first model year of the Mercury Mountaineer is the 1997 model it would be ( r134a )
R134a
R134a
R134a
R134a
R134A
All
R134a
R134a is the only freon for cars after 1994. Earlier cars can be retrofitted to R134a.
R134a
R134a
R134a