The tension pulley is in the center of the sepentine belt, it is one of the smaller pullies that is smooth on top. You will feel a bolt on the fron of it (a 15 millimeter I believe) you need to put the wrench on it and hook a cheater bar, or another wrench (lock the ends together) and pull down towards the front of the car. When the belt is loose slip it off. It is much easier to do with two people. CAUTION! This pulley is sring loaded and very hard to pull down, if you loose your grip or your wrench slips you or the person helping could be seriously injured.
R134a
The coolant temperature sending unit on a 97 Mercury Sable is in the engine compartment. It is located on the intake manifold.
remove drive belt and check all pulley wheels for freedom of movement sounds like a pulley wheel is bad, probably the belt tensioner pulley
yes
Its similar to the 97 pulley however some advances were made primarily in the metallurgy processes during manufacture, it still retains the tension capability however at an increased pulley factor.
A K&N air filter.
Idle air control? Fuel pump? Coil?
stuck closed thermeostat or blown cylinder head gasket.
i think i had the same problem in my 97 mercury sable ,,,mine turned out to be a transmission problem. .i would also check fuel filter ,,its located in the lower rear quarter panel
it should be on the left side of the trunk underneath the carpeting. just pull that off and it's bolted to the side.
It turned out to be quite simple. The tension pulley is spring loaded. Just put a wrench on the nut of the pulley shaft and you can move the pulley to relieve the tension (do not to loosen the nut) and slip the old belt off. Same procedure to install the new belt. Tension pulley is behind the radiator and a little left of center. Just remove the air intake duct above the radiator. Mine is a '97, but should be similar.
Changing the serpentine belt on a 97 Mitsubishi Diamante is a fairly easy task. All you need to do is get a wrench and loosen the tension pulley and pull of the serpentine belt.