Question about 1986 GMC Jimmy

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Where can i find the thermostat on 1986 gmc jimmy

Where can i find the thermostat on a 1986 gmc jimmy 5.7l engine?

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  • oraanshlomo Nov 19, 2009

    so is it after i remocve the elbow thing where the hose from the radiator contects to the intake manifold or is it in that little elbow thing where the hose connecrts, becuz the only thing i see after i take out the elbow is some sort of liquid

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  • GMC Master
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Hi:
The thermostat is under a thermostat housing, and it is located where the upper radiator hose connects to your engine. To swap it, make sure your truck is cold, drain the radiator, un hook the upper radiator hose, and remove the bolts from the thermostat housing. clean up the surfaces, and use a new gasket,

Posted on Nov 19, 2009

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  • GMC Master
  • 2,984 Answers

Follow the upper radiator hose to the outlet elbow (the waterneck!) and it is located under it:

Removal & Installation

  1. Drain the radiator until the coolant level is below the thermostat level (below the level of the intake manifold).
CAUTION 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.

  1. Remove the water outlet elbow assembly from the engine. Remove the thermostat from inside the elbow.
  2. 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.

Posted on Nov 19, 2009

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Posted on Jan 02, 2017

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