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Re: finding radiator thermostat on 1986 gmc jimmy 5.7l
The thermostat is on the end of the radiator hoseat the engine.Just follow the upper radiator hose the the engine and the hose hooks up to the thermostat housing.Remove the 2 bolts and the thermostat is under this housing.
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hi, if you are speaking of a 1999 gmc jimmy, yes, the engines in both vehicles use the same thermostat. the thermostat is located inside the thermostat housing which is connected to the upper radiator hose, and mounted on the top of the engine to the intake manifold. it maybe a plastic housing, or aluminum, it will have two bolts. follow the upper radiator hose away from the radiator and where it ends, is where the housing is.
Follow the upper radiator hose to the outlet elbow (the waterneck!) and it is located under it:
Removal & Installation
Drain the radiator until the coolant level is below the thermostat level (below the level of the intake manifold).
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.
Remove the water outlet elbow assembly from the engine. Remove the thermostat from inside the elbow.
Install new thermostat in the reverse order of removal, making sure the spring side is inserted into the elbow. Clean the gasket surfaces on the water outlet elbow and 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 inch bead of RTV sealer all around the thermostat housing sealing surface on the intake manifold and install the housing while it is still wet. Refill the radiator to approximately 21/2 inch below the filler neck.
If the thermostat is equipped with a pin hole, be sure to install pin side facing upwards.