B: Cooling Fan Motor Inspection
PROCEDURE B: Cooling Fan Motor InspectionRECOMMENDATION: If this is your first time performing this Service Procedure it is recommended that you view the video clip on "ASIST" before starting. To view the "video" clip open the bulletin on ASIST and select Video at the bottom of the screen. To view the video full screen right click the center of the video screen and select Full Screen.
1. Inspect the wires near the condenser fan motor:
^ Make sure there is no damage to the wire insulation and the wires are in good condition.
^ If the wires are damaged (cracked or missing insulation), STOP; no more testing is needed. Go to Procedure C, and replace the condenser fan assembly.
2. Disconnect the condenser fan electrical connector.
IMPORTANT:
Do not lose the rubber seal from inside the connector.
3. Shake the bottle of reflective paint and open an applicator.
^ Reflective paint and applicator are part of special tool kit J-49489.
^ Additional reflective paint and applicators can be ordered from TECH-MATE.
4. Paint a dime sized area on the outer portion of one fan blade.
^ Make sure the painted area is completely filled in (no unpainted spots or thin paint in the dime sized area).
^ Allow the paint to dry-about 5 minutes.
5. Before connecting to the vehicle battery make sure the Fan Motor Tester is switched OFF.
6. Connect the Fan Motor Tester and the Fluke Digital Multimeter (using the fluke meter test leads) as follows (see Figure B-4):
^ Connect Fan Motor Tester harness connector to the condenser fan.
^ Connect Fan Motor Tester to the vehicle battery; Red clamp to + (positive) / Black clamp to - (negative).
^ Connect the Fluke digital multimeter to the MOTOR VOLTAGE test ports on the Fan Motor Tester; V+ red probe to POS / COM black probe to NEG.
NOTE:
When connected as above with the Fan Motor Tester switched OFF the LED on the switch will illuminate green; this indicates the tester has battery power.
Testing Condenser Fan Motor
CAUTION:
Make sure there are no objects in the way of the fan blades. Keep all objects away from directly contacting the fan blades when the fan motor is running.
7. Switch the Fan Motor Tester to ON observe the fan operation for 3 to 4 seconds and then turn the Fan Motor Tester OFF:
^ If the fan turned and operated freely; go to step 8.
^ If the fan did not operate freely; this indicates the fan motor is NG and must be replaced. No further testing is needed; go to Procedure C.
8. Prepare the Fluke Meter and the Phototach Digital Tachometer for the next test as follows.
a. Switch the Fluke Meter to read DC Volts.
b. Remove the Phototach Digital Tachometer from its case and have it ready to check the fan RPM.
NOTE:
It is important that readings from these two meters be read and recorded at the same time in the next test.
C. Practice using the Phototach Digital Tachometer as follows:
1. Do not turn the fan motor tester ON at this time.
2. Press and hold the TEST button on the Phototach Digital Tachometer.
WARNING:
Do not shine or point the red light beam from the Phototach Digital Tachometer into anyone's eyes (including your own).
3. Hold the digital tachometer about 4 inches away from the condenser fan.
4. Aim the red beam at the painted area on the fan blade.
^ The beam should be aimed between / through the slots in the fan shroud.
9. Measure the fan motor speed (RPM) and fan motor voltage as follows:
a. Turn the Fan Motor Tester ON.
NOTE:
In the ON position the LED light on the switch will illuminate yellow.
b. Press and hold the TEST button on the Phototach Digital Tachometer.
WARNING:
Do not shine or point the red light beam from the Phototach Digital Tachometer into anyone's eyes (including your own).
b. Hold the digital tachometer about 4 inches away from the condenser fan.
c. Aim the red beam at the painted area on the fan blade.
^ The beam should be aimed between / through the slots in the fan shroud.
d. Observe the RPM reading on the tachometer and the volt reading on the Fluke Meter.
IMPORTANT:
The RPM and voltage reading should be observed at the same time with the fan motor running.
10. Record / write down the RPM and Volt readings you observed in step 9 d.
NOTE:
Pressing the MEM (memory) button on the Phototach Digital Tachometer will display the last RPM measurement.
11. Switch the Fan Motor Tester to OFF.
12. Disconnect the testers from the vehicle.
13. Use the chart above to determine if the fan motor is OK or No Good.
^ Find the intersecting point of your RPM and Voltage readings that you wrote down in step 10.
NOTE:
If voltage reading is less than 10.0 V charge the vehicle battery and retest. Do not perform fan motor test with a charger attached to the vehicle battery.
15. Determine your next steps as follows:
If the fan motor is OK:
a. Remove the Condenser Fan Assembly - Procedure C steps 1 though 15.
b. Install the Condenser Fan Motor Protective Coverings - Procedure D.
c. Reinstall the Condenser Fan Assembly - Procedure C steps 16 through 31.
d. Confirm Condenser Fan Motor operation - Procedure F.
If the fan motor is No Good:
a. Replace the Condenser Fan Assembly - Procedure C.
b. Install the Max Fuse - Procedure E.
c. Confirm Condenser Fan operation - Procedure F.