Removal & Installation
4.2L Engine
To install:
Fig. Thermostat mounting-4.2L engine
4.3L Engine
The thermostat is located between the water outlet and a housing built into the intake manifold.
CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
Fig. Unfasten the thermostat outlet-to-engine bolts
Fig. Remove the outlet from the intake manifold
Fig. Remove the thermostat from the housing
To install:
5.3L Engine
NOTE
The thermostat is not serviceable separately. The water pump inlet and thermostat must be replaced as an assembly.
To install:
To change the thermostat on a 2002 GMC Envoy 4.2, first, ensure the engine is cool, then disconnect the negative battery cable. Drain the coolant from the radiator and remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing to access the thermostat, replace it with a new one, and reassemble everything in reverse order, making sure to refill the coolant and check for leaks. Finally, reconnect the battery and start the engine to ensure proper operation.
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To change the thermostat on a 2005 GMC Envoy, first ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing, replace the old thermostat with a new one (making sure to align it correctly), and reassemble everything by reversing the steps. Finally, refill the coolant and check for leaks.
The pump is in the gas tank and the tank has to come down to change it.
To change the thermostat on a 2002 Mercury villager, pull the hose away. If the bolts do not come off, wiggle the fitting to expose the thermostat to be able to change it.
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GMC Envoy was created in 2002.