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agreed.upper hose cold/lower hose warm,stuck closed t-stat.
the T-sat needs to be motorcraft only.
aftermarket ones will not work properly.
the part# is: RT1049 (old part#E5TZ8575C)
places like rockauto and amazon have fair deals on them,unlike your local stealership.
if you haven't done so yet,
now is the best time to learn about proper coolant and maintenance for your IDI: Cavitation-The Complete Guide