Mercury 2L2Z-8575-AA Thermostat Assembly

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Check the coolant level, drive belt tension, and temperature gauge to diagnose cooling system problems. If the engine takes too long to warm up, replace the thermostat. If the engine overheats, feel the upper radiator hose, if not hot, replace the thermostat. Never run an engine without a thermostat since it damages computers, emissions, and fuel economy. Assessing the upper radiator hose temperature aids in confirming whether or not a thermostat is open. Disconnect the battery cables before removing the air cleaner duct and draining the cooling system. Also, locate and disconnect electrical connectors at the thermostat housing, remove a hose from it, take out a housing cover and see how the thermostat is positioned.

If the engine warms up slowly or if it overheats with a cool upper radiator hose, it suggests a problem with the thermostat.

In cases of engine overheating, assess the upper radiator hose temperature. If the hose remains cool while the engine overheats, a stuck-closed thermostat may be to blame. In such cases, the thermostat should be replaced.

To replace the thermostat, you should first disconnect the negative battery cable, remove the air cleaner air duct, and drain the cooling system. Then, locate the thermostat housing, loosen the hose clamp, and detach the hose. Remove the housing cover, extract the old thermostat, clean the housing and cover surfaces, and install the new thermostat with attention to proper orientation. Finally, reassemble the components, refill the cooling system, and start the engine to ensure there are no leaks and verify thermostat functionality at normal operating temperature.

1. Disconnect the cable from the negative battery terminal.2. Drain the cooling system and consider reusing the coolant if it is still in good condition.3. For V6 models, disconnect the alternator harness bracket. For 2003 and earlier V8 models, remove the engine trim cover.4. Trace the upper radiator hose to the engine to find the thermostat housing.5. Loosen the hose clamp and remove the deteriorated hose if necessary.6. If the thermostat housing cover shows signs of corrosion or damage, replace it.7. For V6 and V8 models, remove the fasteners, detach the thermostat cover, note its orientation, and then remove the thermostat.8. Clean off old gasket residue and fit a new rubber gasket onto the thermostat.9. Place the thermostat in its designated housing and secure the thermostat housing cover.10. Reattach the radiator hose and ensure the hose clamp is snug.11. Refill the cooling system, start the engine, let it reach its normal operating temperature, and check for leaks and proper thermostat functioning.

Yes, the thermostat has a jiggle valve integrated in it

The thermostat opens at 92 degrees