I have a 2000 merc Grand Marquis with the 4.6 engine. The garage I go to has tried to twice to change the thermostat but have been stopped dead, fearful, that the bolts going into the plastic intake manifold are going to snap off. If that happens they say that it would require a new manifold and lts of expensive labor.
I have been in the garage on two other occasions when they have not been able to remove the bolts on two 4.6 engines to change the thermostat.
What a horseshit design problem in my estimation. Has anyone else had this problem with those damned plastic intake bolts for the thermostat?
Thanks