REMOVAL & INSTALLATION
See Figures 1, 2, 3 and 4
- Drain the radiator until the level is below the thermostat level (below the level of the intake manifold).
- Some late model vehicles will contain 1 or more Thermal Vacuum Switches (TVS) threaded into the top of the thermostat housing. If so equipped, tag and disconnect the vacuum lines from the valves.
- Loosen the retaining bolts, then remove the water outlet elbow (thermostat housing) assembly from the engine.
- Grasp the top of the thermostat and withdraw it from the bore. If necessary, use a pair of pliers to grip the top of the thermostat and pull it from the opening. Note the direction of the thermostat which was facing the engine for installation purposes.
- Clean the gasket mating surfaces on the water outlet elbow and the intake manifold.
- Install the thermostat assembly into the bore in the direction noted during removal.
- Install the water outlet elbow (thermostat housing) to the intake manifold. Use a new gasket when installing the elbow to the manifold. On later models the thermostat housing may have been sealed with RTV sealant. If so, place a 1 / 8 in. bead of RTV sealer all around the thermostat housing sealing surface on the intake manifold and install the housing while it is still wet.
If the thermostat is equipped with a pin hole, be sure to install pin side facing upwards.
- Secure the thermostat housing using the retaining bolts.
- If applicable, connect the vacuum lines to the TVS(s) as noted during removal.
- Refill the engine cooling system, then start the engine and check for leaks.