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find the water pump. it will be right behind the fan. there is a short elbow hose coming from the water pump to the housing of the thermostat. also there is a large hose that leads to the radiator. remove both of the hoses from the housing. then you will have to remove two bolts that hold the housing on. once those are off pop out the old and get all of the old seal off of all parts. then put the new one in and put the new seal over the top. this will hold the thermostat in place. then put everything back together.

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17y ago
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Q: Where is and how do you change the thermostat on a 1999 Mountaineer?
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