Radiator: Service and Repair

RADIATOR






COMPONENTS

REMOVAL

1. Disconnect the fan motor plug.
2. Set the warm engine coolant flow control knob of the heater control to the hot position.
3. Loosen the radiator drain plug to drain coolant.
4. Disconnect the upper and lower hose. and the overflow tube.
5. For vehicles with an automatic transaxle, disconnect the oil cooler hoses from the automatic transaxle.

CAUTION: Plug the ends of the oil cooler hoses and the automatic transaxle port to prevent the transaxle fluid from spilling out and foreign material from getting in.

6. Remove the radiator mounting bolts.
7. Remove the radiator together with the fan motor.
8. Remove the fan motor from the radiator.

INSPECTION
1. Check the radiator for bent. broken, or plugged fins.
2. Check the radiator for corrosion, damage, water or scale.
3. Check the radiator hoses for cracks, darnage or deterioration.
4. Check the reservoir tank for damage.
5. Check the radiator cap spring for damage. Pressure test the cap using a cooling system checker.
6. Check the radiator cap seal for cracks or damage.






7. Check for continuity with the thermo switch in hot water.

Continuity at
85 ± 3°C (165 ± 5.4°F) [1.6L Eng.]
90 ± 3°C (194 ± 5.4°F) [1.8L Eng.]
No continuity at
81 ± 3°C (178 ± 5.4°F) [1.6L Eng.]
83°C (181.4°F) or more [1.8L Eng.]

NOTE: Immerse the thermo switch in hot engine coolant up to the mounting threads to check for continuity.






8. Check for continuity with thermo switch B in hot engine coolant.

Continuity at 103°C (217.4°F)

No continuity at 110°C ± 3° (230 ± 5.4°F) or more











9. Check for continuity with thermo sensor on water outlet fitting in hot water.

Continuity at 102-108°C (215.6-226.4°F)

No continuity at 96°C (208.4°F) or more

Fig. 1 Radiator Fan Motor Terminal Identification:

Radiator Fan Motor
1. Check to be sure that the radiator fan rotates when battery voltage is applied between the terminals (as shown in the figure).
2. Check to see that abnormal noises are not produced while the motor is turning.

INSTALLATION
1. Fill the radiator and reservoir tank with a fresh coolant mixture.
2. Run the engine until the coolant has warmed up enough so that the thermostat valve opens. and then stop the engine.
3. Remove the radiator cap, pour in the coolant until it is up to the filler neck of the radiator1 and then fill the reservoir tank to the upper level.
4. Check to be sure that there is no leakage from the radiator, hoses or connections.