Honda 19301-P8E-A10 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.

Before assuming the thermostat is responsible for a cooling system issue, inspect the coolant level, drivebelt tension, and temperature gauge operation. If the engine takes a long time to warm up based on the heater output or temperature gauge, the thermostat might be stuck open, and you should replace it with a new one. If the engine is hot but the lower radiator hose isn't, the thermostat might be stuck closed, preventing the coolant in the engine from reaching the radiator. In this case, replace the thermostat. If the lower radiator hose is warm, it indicates that the coolant is circulating and the thermostat is functioning. For further cooling system diagnosis, consult the troubleshooting section. For replacement: Disconnect the cable from the negative battery terminal. Drain the cooling system, and if the coolant is relatively new or in good shape, keep it for reuse. Remove the air intake duct between the throttle body and the air filter housing. Trace the lower radiator hose to the engine to identify the thermostat housing cover. Loosen the hose clamp and remove the hose from its fitting. If it's tight, use adjustable pliers to twist and detach it. If the hose appears old, replace it. Over time, the thermostat housing cover's hose fitting may corrode. If it's damaged during hose removal, get a new housing cover. Take off the thermostat housing cover bolts and remove the housing cover. Prepare for possible coolant leakage when breaking the gasket seal. There's no need to disconnect ground wires or the ECT sensor connector unless replacing the housing cover. Observe the thermostat's orientation and take it out. Place a new rubber seal on the thermostat, aligning the rubber tang with the jiggle pin. Fit the new thermostat into the housing, ensuring the seal's tang aligns with the housing's notch, positioning the jiggle pin at the top. Reattach the housing cover and tighten its bolts. Reconnect the hose, ensuring the clamp is secure. Reinstall any removed components. Refill the cooling system. Connect the battery. Finally, start the engine, let it reach its normal temperature, and check for any leaks and the thermostat's performance.

Before assuming the thermostat is responsible for a cooling system issue, inspect the coolant level, drivebelt tension, and temperature gauge operation. If the engine takes a long time to warm up based on the heater output or temperature gauge, the thermostat might be stuck open, and you should replace it with a new one. If the engine is hot but the lower radiator hose isn't, the thermostat might be stuck closed, preventing the coolant in the engine from reaching the radiator. In this case, replace the thermostat. If the lower radiator hose is warm, it indicates that the coolant is circulating and the thermostat is functioning. For further cooling system diagnosis, consult the troubleshooting section. For replacement: Disconnect the cable from the negative battery terminal. Drain the cooling system, and if the coolant is relatively new or in good shape, keep it for reuse. Remove the air intake duct between the throttle body and the air filter housing. Trace the lower radiator hose to the engine to identify the thermostat housing cover. Loosen the hose clamp and remove the hose from its fitting. If it's tight, use adjustable pliers to twist and detach it. If the hose appears old, replace it. Over time, the thermostat housing cover's hose fitting may corrode. If it's damaged during hose removal, get a new housing cover. Take off the thermostat housing cover bolts and remove the housing cover. Prepare for possible coolant leakage when breaking the gasket seal. There's no need to disconnect ground wires or the ECT sensor connector unless replacing the housing cover. Observe the thermostat's orientation and take it out. Place a new rubber seal on the thermostat, aligning the rubber tang with the jiggle pin. Fit the new thermostat into the housing, ensuring the seal's tang aligns with the housing's notch, positioning the jiggle pin at the top. Reattach the housing cover and tighten its bolts. Reconnect the hose, ensuring the clamp is secure. Reinstall any removed components. Refill the cooling system. Connect the battery. Finally, start the engine, let it reach its normal temperature, and check for any leaks and the thermostat's performance.

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.

Disconnect the cable from the negative battery terminal. Drain the cooling system. Remove the battery. Follow the lower radiator hose to the engine to locate the thermostat housing cover. Use pliers to squeeze the coolant hose clamp and slide the clamp away from the thermostat housing. Loosen the hose clamp, then detach the hose from the fitting. Remove the thermostat cover bolts and detach the housing cover. Remove all traces of old gasket material or sealant from the housing and cover. Install a new rubber seal over the thermostat. Install the new thermostat in the housing without using sealant. Install the housing cover and bolts. Tighten the bolts. Reattach the hose and tighten the hose clamp securely. Install all components that were removed for access. 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.