There is no such thing as Air Conditioning coolant.
Air Conditioning
R134a freon............
You can find this at you local public library...........
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No.
in the engine compartment it is the top steel line on the passenger side of the car under the black plastic cap
Liquid coolant
fill till the level in the resovor is at the cold line. run the engine to bleed the air out and then check it again
On a 2001 Mercury Cougar : The Mass Air Flow Sensor is between the engine air filter and the big engine air intake tube
It strains any impurities from the coolant.
A little more information please . What year , four cylinder or V6 , automatic or manual transmission . Then someone can probably answer your question about the coolant system capacity of a Mercury Mystique . Thanks ( also might need to know if it has air conditioning )
it is black and on the drivers side front of the motor it is aluminum looking under the cap