I don't know for sure but you could always go ahead and replace the thermostat. There inexpensive and easy to replace. I'd start there if I were you. 4 years sounds like an outlived life for a thermostat.
Good luck, James
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90' Mustang GT Convertible-
C4 w/ manual body
4.10's soon to be 3.27's
2 Ch Flowmasters
1/8th ET 9.04
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