The coolant temperature sending unit on a 97 Mercury Sable is in the engine compartment. It is located on the intake manifold.
A 97 Mercury Villager should use r134a type freon. The valve size is designed so that the r12 fittings cant accidentally be used.
Your car probably has R134a refrigerant in it.
yes
R134a
134A
r 134a
R134a
R134a freon.........
R-134a
A K&N air filter.
Idle air control? Fuel pump? Coil?