How to Replace the Thermostat on a Jeep Cherokee
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The thermostat controls the machine temperature in the Jeep Cherokee. It is settled at the front of the cylinder head inside the water outlet. The thermostat limits coolant flow until the machine reaches 195 degrees F. With the thermostat open, coolant is free to flow to the radiator to be cooled. The thermostat opens and closes to regulate the flow and say the permissible operating temperature for the engine.
How to Replace the Thermostat on a Jeep Cherokee
How to Replace the Thermostat on a Jeep Cherokee
Automotive thermostats consist of a wax pellet that melts at a predetermined temperature. As the wax melts, it opens the valve in the thermostat. As the valve ages, it can become partially stuck in either the open or ended position. Also, some thermostats have a latching mechanism that prevents the thermostat from ever closing again if it exceeds a unavoidable temperature such as in an overheating episode.
How to Replace the Thermostat on a Jeep Cherokee
How to Replace the Thermostat on a Jeep Cherokee
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How to Replace the Thermostat on a Jeep Cherokee
To turn the thermostat, you must take off the water outlet from the cylinder head. The outlet is held in place by two bolts. The upper bolt is easy to access. However, the drive belt blocks way to the lower bolt.
How to Replace the Thermostat on a Jeep Cherokee Specifications
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How to Replace the Thermostat on a Jeep Cherokee
While it is inherent to work colse to the belt, it is usually easier and less frustrating to loosen the belt and move it out of the way. It is especially hard to get the lowest bolt restarted into the hole correctly with the belt in place.
When the theory is opened, coolant will be lost. either park the Jeep where the coolant can be collected or drain the radiator by removing the lower radiator hose. either way is messy, so be prepared. Remember that anti freeze is toxic to pets and wildlife.
Remove the two hoses from the water outlet. take off the two bolts. Gently pry the water outlet off. More coolant will likely come out at this point. The thermostat will likely stay in the head. Gently pop it loose.
Clean the mating surfaces of any old gasket material and corrosion. Attach the new gasket to the water outlet. If the new gasket does not have an adhesive, use a gasket sealer to attach it to the outlet piece. Setup the new thermostat in the recess in the head. It should stay put. If it does not, try a spot of gasket sealer to hold it in place. If it slips out of the groove while installing the water outlet, it will cause a leak.
Place the water outlet over the new thermostat and Setup both bolts. Tighten them evenly. If you previously loosed the belt, tighten it now.
Leave the water hoses off and add coolant until it comes out the heater hose connection. Setup the heater hose. Continue to add coolant until it comes out the larger connection. Setup that hose. Continue to add coolant to fill the system.
There will likely still be some air in the system. either take off the temperature sensor at the back of the head to bleed the air or heat cycle the machine a concentrate of times to purge the air.
Check for leaks. Test-drive the Jeep to make sure the new thermostat controls at the literal, temperature. If the machine has been running too hot or too cold due to a bad thermostat, the computer may take time to adjust. There may also be other damage that caused overheating such as a leaking head gasket. The Jeep 4.0 machine is pretty tough and can survive some overheating. Recheck the coolant level again after the machine cools off.
How to Replace the Thermostat on a Jeep Cherokee
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How to Replace the Thermostat on a Jeep Cherokee
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