Chevrolet 10021199 Housing,Engine Coolant Thermostat

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For 1982 and later L4 models, the thermostat and housing have been redesigned for simpler servicing. To replace the thermostat, first remove the thermostat housing cap. Then, grasp the thermostat handle and pull it out. Replacement is completed by pushing the thermostat into the housing, making sure it is seated, and installing the cap.

If the thermostat checks out OK, reinstall it.

The only way to test the operation of the thermostat is with the unit removed from the engine. In most cases if the thermostat is suspect it is more economical to merely buy a replacement thermostat as they are not very costly. To test, first remove the thermostat. Inspect the thermostat for excessive corrosion or damage. Replace the thermostat with a new one if either of these conditions is found. Place the thermostat in hot water 25 degrees above the temperature stamped on the thermostat. The water temperature should be approximately 220. When submerged in this water, which should be agitated thoroughly, the valve should be fully open. Now remove the thermostat using a piece of bent wire and place it in water which is 10 degrees below the temperature on the thermostat, or about 185 degrees. At this temperature the thermostat valve should close fully. Reinstall the thermostat if it checks out OK, if not purchase a new thermostat of the same temperature rating.

If the thermostat checks out OK, reinstall it.

Before installation, use a gasket scraper or putty knife to carefully remove all traces of the old gasket on the thermostat housing and the water outlet cover. Make sure not to allow any gasket particles to drop down into the water passage.

The thermostat is designed to open and close at predetermined temperatures to allow coolant to warm up or cool the engine.