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To change the thermostat on a 1999 Honda Passport, start by ensuring the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then remove the radiator hose connected to the thermostat housing. Unscrew the thermostat housing, replace the old thermostat with a new one (making sure to align it correctly), and reassemble by reversing the steps. Finally, refill the coolant, reconnect the battery, and start the engine to check for leaks.

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How do you change the thermostat on a 99 Honda passport?

To change the thermostat on a 1999 Honda Passport, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator and remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing to access the thermostat, remove the old thermostat, and clean the mating surfaces. Install the new thermostat, reassemble the housing and hose, refill the coolant, and reconnect the battery.


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I have a 2000 Honda Passport that is just about to be fitted with a 1999 transmission, I will let you know soon..er..or later!


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