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OPERATION The wax pellet is located in a sealed container at the spring end of the thermostat. When heated, the DIAGNOSIS AND TESTING—THERMOSTAT ON-BOARD DIAGNOSTICS All gasoline powered models are equipped with On-Board Diagnostics for certain cooling system com- The DTC can also be accessed through the DRB scan tool. Refer to the appropriate Powertrain Diag- REMOVAL WARNING: DO NOT LOOSEN RADIATOR DRAIN- Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse. If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model Factory installed thermostat housings on 3.9L and 5.9L engines are installed on a gasket with an anti- (1) Disconnect negative battery cable at battery. below thermostat (Refer to 7 - COOLING - STAN- (3) Air Conditioned vehicles: Remove support bracket (generator mounting bracket-to-intake mani- NOTE: On air conditioning equipped vehicles, the (4) Remove accessory drive belt (Refer to 7 - COOLING/ACCESSORY DRIVE/DRIVE BELTS - REMOVAL) (Fig. 16). (5) Remove two generator mounting bolts. Do not remove any wiring at generator. If equipped with (6) Remove generator. Position generator to gain access for thermostat gasket removal. WARNING: CONSTANT TENSION HOSE CLAMPS CAUTION: A number or letter is stamped into the (7) Remove radiator upper hose clamp and upper hose at thermostat housing. (8) Position wiring harness (behind thermostat housing) to gain access to thermostat housing. (9) Remove thermostat housing mounting bolts, thermostat housing, gasket and thermostat (Fig. 18). INSTALLATION (1) Clean mating areas of intake manifold and thermostat housing. Fig. 15 Generator Support Bracket—3.9L and 5.9L Engine 1 - IDLER PULLEY BUSHING 7 - 40 ENGINE AN ENGINE COOLANT THERMOSTAT - 3.9L/5.9L (Continued) |