How do you replace the thermostat on a 1987 mercury grand marquis?
First, drain the cooling system, remove the radiator hose, detach Êthe thermostat cover from engine, and remove the thermostat and O-ring seal. Then clean the sealing surface, install the new thermostat and its O-ring seal. Alternately tighten the housing, and connect the radiator hose.Ê
Replacing the thermostat on a 1996 Grand Marquis is not very hard. First, follow the upper radiator hose to find the thermostat. Then disconnect the hose and drain it. After the hose is drained, remove the bolts holing the thermostat housing in place. Take the old thermostat out and replace with a new one.