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Disconnect the negative battery cable.
Drain the coolant into a clean container so it can be reused.
Disconnect the upper radiator hose from the thermostat housing.
Unbolt and remove the thermostat housing. If necessary, remove intake manifold to gain access. Remove the thermostat and its gasket.
Clean the sealing surface. Use a new gasket and install the thermostat with the spring toward the engine. Torque the thermostat housing mounting bolts to 14 ft. lbs. (19 Nm).
If removed, install intake manifold assembly.
Connect the radiator hose to the thermostat housing.
Refill and bleed the cooling system.
Connect the negative battery cable.
Start the engine and add coolant as needed until the level stabilizes below the radiator cap.
Install the radiator cap and check for leaks.
Saturday, July 25th, 2009 AT 3:18 PM