Jeep CJ/Scrambler 1971-1986 Repair Guide



See Figures 1, 2 and 3


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.

The thermostat is located in the water outlet housing at the front or on top of the engine. On the V6 and the 304 V8 the water outlet housing is located in the front of the intake manifold.

To remove the thermostats from all of these engines, first drain the cooling system. It is not necessary to disconnect or remove any of the hoses. Remove the two attaching screws and lift the housing from the engine. Remove the thermostat and the gasket. To install, place the thermostat in the housing with the spring inside the engine. Install a new gasket with a small amount of sealing compound applied to both sides. Install the water outlet and tighten the attaching bolts to 30 ft. lbs. Refill the cooling system.

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Fig. Fig. 1: Remove the thermostat housing retaining bolts and lift the housing from the engine

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Fig. Fig. 2: Remove the old gasket and replace it

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Fig. Fig. 3: Pull the thermostat from the housing, check it for proper operation and replace it if needed