Looks like your thermostat is not working properly, or something is blocking
the proper flow of coolant. Last time I had a similar problem in a 1990
Taurus, the thermostat had fail in the almost closed position. You can check
by feeling the upper radiator hose while the engine is running, and just
after shut down. If the hose is hot the thermostat is open and allowing
coolant flow.It should also allow some compression. If it is cool and
compressible, it suggest it is most likely closed and not allowing any
coolant flow. Shut the engine down and observe the temperature and hardness
of the upper radiator hose. If it becomes really hot and rock hard, you most
likely have a thermostat stuck in the closed position.
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