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TO replace a thermostat, begin by draining the coolant completely from the engine. You can flush out the system with water at this point if you like. Next, locate your thermostat housing and remove the hose from it that goes to the radiator. Then remove the housing and take out the thermostat, it should just pop out. Clean the surfaces around where the thermostat goes and put the new one in. Replace the housing gasket and re-install it. Next put the radiator house back on the housing using a new clip. Now add coolant to the radiator until it is full, but be aware that you will need to add more as you start the engine and the system is filled. add more coolant until the level reaches the top of the radiator, and just barely starts to overflow into the resivior. Wait for all the bubbles to stop before putting the radiator cap back on before ti gets to warm. Check for leaks.

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11y ago
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Q: How do you replace the thermostat located on a 1994 Mazda Navajo?
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