Honda 19301-R40-A02 Thermostat Assembly (Nippon Thermostat)

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Check coolant level, drivebelt tension and temperature gauge. Replace thermostat if engine takes long to warm up. If engine runs hot, disconnect battery, remove battery and air filter housing, drain cooling system, locate thermostat housing cover, remove quick connect fitting or loosen hose clamp, take note of thermostat installation, remove thermostat housing cover bolts and cover, remove old seal, install new seal or O-ring, install thermostat, install thermostat housing cover, reattach hose and tighten hose clamp, refill cooling system, reconnect battery, start engine and allow to reach normal operating temperature, check for leaks and proper thermostat operation.

The thermostat is probably stuck closed, preventing the coolant inside the engine from escaping to the radiator. Disconnect the cable from the negative battery terminal, remove the battery and air filter housing (2013 and later models), drain the cooling system, follow the lower radiator hose to the engine to locate the thermostat housing cover, remove the quick connect fitting (four-cylinder engines) or loosen the hose clamp (V6 engines), take note of how the thermostat is installed, remove the thermostat housing cover bolts and cover, remove all traces of the old seal from the mating surfaces, install a new seal (V6 models) or O-ring (four-cylinder engines), install the thermostat, install the thermostat housing cover, reattach the hose and tighten the hose clamp, refill the cooling system, reconnect the battery, start the engine and allow it to reach normal operating temperature, then check for leaks and proper thermostat operation.

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