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Drain about 1 gallon of coolant from radiator
Remove housing at the engine end of the upper radiator hose
Note how thermostat is installed
Clean surfaces
Replace thermostat and gasket
Re-fill coolant slowly to prevent an air lock
Start engine and look for leaks
Run engine to normal operating temperature with heater on
Re-check coolant level

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Q: How do I change the thermostat on a 98 altima?
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