The Honda employs water-cooling for engine heat dissipation. Air is forced through the radiator by an electric fan which is, in turn, activated by a water temperature sensor screwed into the base of the radiator.
REMOVAL & INSTALLATION
See Figures 1 through 5
When removing the radiator, take care not to damage the core and fins.
- Position a clean drain pan under the radiator, open the drain plug, remove the radiator cap and drain the cooling system.
- Disconnect the electrical connectors from the thermo-switch and the cooling fan motor.
- Disconnect the upper coolant hose at the upper radiator tank and the lower hose at the water pump connecting pipe. Disconnect the overflow hose from the coolant tank.
- Remove the turn signals (Civic 1973-77) and front grille.
- Remove the radiator-to-chassis bolts and the radiator with the fan attached. The fan can be easily unbolted from the back of the radiator.
- Inspect the hoses for damage, leaks and/or deterioration; if necessary, replace them. If the radiator fins are clogged, wash off any insects or dirt with low pressure water.
- To install, use new O-rings (if used) and reverse the removal procedure. Torque the radiator-to-chassis bolts to 7 ft. lbs. Refill and bleed the cooling system; if equipped with a coolant reservoir, be sure to fill it to proper level. Start the engine, allow it to reach normal operating temperatures and check for leaks.