How do you change the thermostat on a 1999 Pontiac Sunfire?

Answer 1

2.2L OHV Engines * Drain coolant (about 1 gallon) from the radiator until its below the thermostat housing * Disconnect the radiator hose from the thermostat cover * Remove the bolts and lift the cover off you mat have to tap the cover with a soft-face hammer to loosen it * Not how its installed then remove the thermostat 2.3L and 2.4L OHC Engines * Drain the coolant from the radiator * Remove the exhaust manifold heat shield * Remove the cover that protects the outlet pipe on the thermostat housing by accessing cover bolts through the exhaust manifold runners * Raise and secure the car on jackstands * Disconnect the radiator hose from the metal outlet pipe * Remove the outlet pipe bolt and carefully separate the outlet pipe from the thermostat housing and the engine block * Note how its installed then remove the thermostat from the outlet pipe