One of the most regular reasons a machine or Motor lorry engine overheats is a defective thermostat.10. Replace a faulty thermostat. Reinstall it if it opens and closes properly, and look for another problem in the cooling system.
1. Place the engine's thermostat, usually at the front of the engine, by tracing the soak hoses from the radiator to the engine. One hose goes from the radiator into the thermostat housing on one side, and the other hose goes absent of the housing back to the radiator on the other side.
2. Yawning the radiator cap and verify that the radiator is all-inclusive. Interchange the radiator cap and launch the engine.
3. Turn the vehicle's heater on formidable. Sanction the engine to melting up for a unusual minutes. Be careful not to let the engine overheat.
4. Touch Everyone of the hoses primary to and from the thermostat housing. Provided both hoses are calescent and the heater is pushing absent decalescent air, the thermostat is functioning properly. If not, the thermostat may be stuck, and you'll need to remove the thermostat from the engine to perform the next test.
Remove and Test the Thermostat
5. Turn off the engine and allow the engine to cool.
6. Remove the bolts holding the thermostat cap in place.
7. Lift off the housing cap to expose the thermostat. Pull the thermostat out of the housing with your fingers. Take careful note of which way it sits so that you can reinstall it or its replacement in the same position.
8. Put the thermostat in a pan of water on the stove, and turn the burner on high.
9. Monitor the water temperature with an oven thermometer. The thermostat should open at about 195 degrees F if it is functioning properly.
The thermostat closes when the engine is crisp and opens as the engine warms up To admit the coolant to circulate wound up the engine. Spring from these steps to examination a cooling system thermostat.
