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This is a 15 year old vehicle. The thermostat is very cheap insurance. Just replace it when performing a cooling system service. Replace it by removing the old thermostat, carefully cleaning off the old gasket. Install the new gasket & thermostat, spring toward engine block, and tighten to factory specs, and no more.

2006-07-22 13:55:17
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Q: How do you replace the thermostat on a 1991 Ford F150 pickup - How do you confirm that the thermostat needs replacement?
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