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For 5.3L engines, loosen the air cleaner outlet duct clamps at the throttle body and Mass Airflow/Intake Air Temperature (MAP/IAT) sensor. Remove the bolt and air cleaner outlet duct.
Relieve the belt tension and remove the accessory drive belts or the serpentine drive belt, as applicable.
Remove or disconnect the following:
For the hoses on some engines, removal may be easier if the hose is left attached until the pump is free from the block. Once the pump is removed from the engine, the pump may be pulled (giving a better grip and greater leverage) from the tight hose connection.W
Note the positions of all retainers as some engines will utilize different length fasteners in different locations and/or bolts and studs in different locations.
Upper fan shroud
Fan or fan and clutch assembly, as applicable
Water pump pulley; use a suitable tool to hold the pulley while removing the bolts
Coolant hose(s) from the water pump
Water pump retainers
Water pump from the engine
4.2L Pump Location
5.3L Pump Location
Clean the gasket mounting surfaces.
The water pumps on some of the engines covered may have been installed using sealer only, no gasket, at the factory. If a gasket is supplied with the replacement part, it should be used. Otherwise, a 1 / 8 in. (3mm) bead of RTV sealer should be used around the sealing surface of the pump.
Apply sealant to the water pump retainer threads.
Install or connect the following:
Water pump using a new gasket. Tighten the water pump retainers to 89 inch lbs. (10 Nm) for 4.2L engines, or to 30 ft. lbs. (41 Nm) for 4.3L engines. For 5.3L engines, tighten the bolts to 11 ft. lbs. (15 Nm), then to 22 ft. lbs. (30 Nm).
Water pump pulley. Tighten the pulley bolts to 18 ft. lbs. (25 Nm).
Fan or fan and clutch assembly
Serpentine drive belt (if equipped) by positioning the belt over the pulleys and carefully allow the tensioner back into contact with the belt.
CJ, this is very common for the I6 engines in TB's and Envoys. You need a new fan clutch. Triple check the wire connectors first, located on the top of the radiator on the drivers side, make sure those are in tact first. Then replace the fan clutch. Might as well do your water pump and serpentine belt while you're in there.
Two possibilities, poor electrical connection at the cam position actuator sensor (CPAS) connector or a clogged CPAS. Check connector first for oil residue. The CPAS itself is prone to clog if the oil is not changed at the proper intervals. Unfortunately, the CPAS is a little difficult to remove since access to one of its bolts requires the removal of the power steering pump.
remove the intake manifold ,remove radiator ,remove radiator intake and outake housing, remove fan ,remove all belts: power steering, alternator and if you have a/c, remove harmonic balancer ,remove timing belt covers, remove timing belt remove intake housinng once you have remove all the above, your freaken engine will look naked, you can see the location of the knock sensor is locate in the engine valley hope this helps u might wnat to google knock sensor so u knoe what it looks like
go to any autopart store and purchase a serpentine belt tool, they are inexpesive and come with parts 4 many different vehicles, then place tool on tensioner pulley and apply pressure untill u have enough slack in belt to remove it