Is the fan clutch operating properly?

-

System OK

Go to Step 2

Check for air leaking from the bleed hose, the air chamber or anywhere on the clutch.

Is there an air leak?

-

Go to Step 3

Go to Step 4

Replace the fan clutch. Refer to Fan Clutch Replacement

Is the repair complete?

-

Go to Step 1

-

Does the fan clutch engage correctly?

-

Go to Step 5

Go to Step 7

Does the fan clutch disengage correctly?

-

Go to Step 6

Go to Step 15

Does the fan clutch cycle too frequently?

-

Go to Step 20

System OK

1. Turn the ignition ON.
2. Start the engine.
3. Let the engine run until it reaches operating temperature.
4. Check the solenoid for 12 volts.

Are 12 volts present at the solenoid?

-

Go to Step 9

Go to Step 8

1. Check the electrical connections.
2. Compare the vehicle to the wiring diagram in order to ensure correct routing.
3. Repair or replace any connections or wires that are incorrect, damaged or defective.

Are the electrical connections and wire routing OK?

-

Go to Step 10

-

Replace the solenoid.

Is the repair complete?

-

Go to Step 4

-

Check for voltage at the thermal switch.

Are 12 volts present at the thermal switch?

-

Go to Step 11

Go to Step 8

Replace the thermal switch.

Does the fan clutch engage correctly?

-

System OK

Go to Step 12

Check the air supply at the solenoid.

Is the air pressure within the values specified?

620-827 kPa 90-120 psi

Go to Step 13

Go to Step 14

Check for air leaking from the bleed hole, the air chamber or anywhere on the clutch.

Is there an air leak?

-

Go to Step 3

Go to Step 9

1. Check the air fittings and the air lines for leaks or pinching.
2. Repair any fittings or lines that leak.

Does the fan clutch engage properly?

-

System OK

Go to Step 4

1. Compare the vehicle to the wiring diagram in order to ensure the correct routing.
2. Repair or replace any connections or wires that are incorrect, damaged or defective.

Are the wires routed properly?

-

Go to Step 16

-

1. Check the thermal switch for proper operation.
2. Replace the thermal switch if it is damaged or defective.

Is the repair complete?

-

Go to Step 17

-

1. Check the solenoid for proper operation.
2. Replace the solenoid if it is damaged or defective.

Does the fan clutch disengage correctly?

-

System OK

Go to Step 18

1. Check the lines for restrictions that might prevent the air in the fan clutch from releasing.
2. Repair or replace any restriced lines.

Are the lines free of restrictions?

-

Go to Step 19

-

1. Check the exhaust port in the solenoid.
2. Replace the solenoid if the exhaust port is plugged.

Is the solenoid OK?

-

System OK

-

1. Check the electrical connections.
2. Compare the vehicle to the wiring diagram in order to ensure correct routing.
3. Repair or replace any connections or wires that are incorrect, damaged or defective.

Are the electrical connections and wire routing OK?

-

Go to Step 21

-

1. Check the thermal switch for proper operation. It should close at 10 ° above normal operating temperature.
2. Replace the thermal switch if it closes before the correct temperature.

Is the repair complete?

-

Go to Step 22

-

1. Check for any obstructions that may prevent the proper air flow through the radiator.
2. Look for debris inside the fan shroud.
3. Clear away any obstructions.

Is the radiator free of obstructions?

-

Go to Step 6

-