Mercury 7L3Z-8575-B Thermostat Assembly

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Don't drive without a thermostat as it can affect emissions and fuel economy. Before blaming the thermostat, check coolant level, drivebelt tension, and temperature gauge. If the engine takes long to warm up or runs hot without the upper radiator hose being hot, the thermostat is likely faulty and needs replacement. Overheating can cause engine damage. To replace the thermostat, drain coolant below the thermostat housing level, disconnect the upper radiator hose, remove the cover and O-ring seal, and note the thermostat's installation. Install a new thermostat with the correct opening temperature, clean the mating surfaces, and apply RTV sealant to a new gasket or O-ring seal. Reattach the cover, radiator hose, refill the system, check for leaks, and repeat steps if necessary.

Loosen the hose clamp, and if the hose is stuck, twist it to break the seal. If it's old or deteriorated, cut it off and install a new one.

1. Disconnect the negative battery cable and drain the cooling system. 2. Locate the thermostat housing in the engine. 3. Remove necessary components to access the thermostat housing. 4. Detach the radiator hose and remove the thermostat housing cover.

The coolant level, drive belt tension, and the operation of the temperature gauge should be inspected.

If the engine runs hot and the upper radiator hose isn't hot, it indicates that the thermostat is probably stuck shut and should be replaced.