1997 - 2001 Ford Explorer 4.0L SOHC V6 - Thermostat Replacement. 1997 - 2001 Ford Explorer 4.0L SOHC V6 thermostat replacement. Not to be confused with the 4.0L OHV V6.
*Be very careful that you do not knick the lip on the inside of the upper thermostat housing. This will cause leakage around the O-ring gasket. It can easily be damaged during removal. This part cost around $20 to replace.
*If you experience a leak in the lower thermostat housing - consider replacing both upper and lower thermostat housings. The lower thermostat housing can leak around the sensor threading surfaces as well as around the seams - this is a common product defect. This part cost between $30 to $40 but takes a considerable amount of time to replace. It is advised to replace the temperature sensor ($10) and temperature sender ($20) during replacement of the lower thermostat housing.
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