CRX L4-1488cc 1.5L SOHC (EW1) 3V Carb (1986)
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Radiator Cooling Fan Motor: Testing and Inspection
W/Carbureted Engine
1.
Start engine and run until it reaches normal operating temperature.
2.
Monitor coolant temperature using suitable thermometer and observe cooling fan operation.
3.
Cooling fan should begin to operate when coolant temperature reaches 191-197°F, and fan should stop running when coolant temperature drops to
182-188°F.
4.
On models with A/C, place control in maximum cooling position. Cooling fan should run whenever A/C compressor clutch is engaged.
5.
Using suitable gauge to monitor underhood temperature, stop engine and listen for cooling fan operation.
6.
With engine stopped and underhood temperature above 122°F, cooling fan should run for a maximum of 15 minutes or until temperature drops
below 118-122°F.
7.
If system fails to operate as outlined, inspect fan circuit for blown fuses, loose connections and damaged wiring, and repair as needed.
8.
If fan circuit wiring is satisfactory, test components individually and replace as needed. If all other components are satisfactory but system still
does not perform as outlined, replace timer module and recheck system operation. Do not attempt to perform resistance measurements
between module terminals as timer module may be damaged.
SYSTEM TEST
W/Fuel Injected Engine
1.
Start engine and run until it reaches normal operating temperature.
2.
Monitor coolant temperature using suitable thermometer and observe cooling fan operation.
3.
Cooling fan should begin to operate when coolant temperature reaches 191-197°F, and fan should stop running when coolant temperature drops to
182-188°F.
4.
If fan fails to operate, proceed as follows:
a. Stop engine, disconnect electrical connector to thermo sensor, connect suitable jumper between connector terminals, then turn on ignition
switch.
b. If fan operates, replace thermo sensor and recheck system operation.
c. If fan fails to operate, check for blown fuse, defective relay, damaged or disconnected wiring or defective fan motor.
5.
On models with A/C, place control in maximum cooling position.
6.
If cooling fan does not operate when compressor clutch is engaged, check for open circuit between fan relay and A/C switch, defective switch or
defective compressor clutch diode.
COMPONENT TESTING
Fan Motor
1.
Disconnect electrical connector to fan motor.
2.
Connect battery voltage across motor terminals using suitable jumper wires.
3.
If fan fails to operate, motor is defective.
Fan Relay
1.
Disconnect electrical connector and remove relay.
2.
Connect ohmmeter between relay terminals 3 and 4.
3.
Meter should indicate no continuity.
4.
Connect battery voltage across terminals 1 and 2, on 1987 models or C & D on 1988 models.
5.
With relay energized, ohmmeter should indicate continuity between terminals 3 and 4.
Thermo sensor
1.
Drain cooling system and remove thermo sensor from radiator.
2.
Connect suitable ohmmeter between sensor terminals.
3.
Heat thermo sensor in suitable solution while observing ohmmeter.
4.
Meter should indicate continuity when temperature reaches 191-197°F.
5.
Allow sensor to cool while observing meter. Meter should indicate no continuity as temperature drops below 182-188°F.
6.
If sensor fails to operate as outlined, sensor is defective.
