SYMPTOM RELATED DIAGNOSTICS

ON/OFF FAN CONTROL VERBAL COMPLAINT (continued)

Test 8

Checking for voltage at the freon fan pressure switch

Test 9

Checking for a failed fan clutch

1.Disconnect the air hose which runs from the solenoid to the fan clutch.

KYSOR FAN CLUTCH:

If air flows out of the solenoid discharge port, the solenoid is defective. Replace the solenoid and retest the fan operation.

If air does not flow out of the solenoid discharge port, there is a problem with the fan clutch. Locate and repair the problem. Retest to be sure the problem has been corrected.

Figure 323 — Voltage from Pin B to Ground

1.Turn the ignition key to the OFF position.

2.Reconnect the fan clutch solenoid to the engine harness.

3.Disconnect the freon fan pressure switch connector from the engine harness.

4.Turn the ignition key to the ON position.

5.Measure the voltage from harness connector pin B (the freon fan pressure switch engine connector), leading back to the solenoid, to a good ground.

If 12 volts are present, proceed to Test 16.

If 12 volts are not present, proceed to Test 17.

HORTON FAN CLUTCH:

If air flows out of the solenoid discharge port, there is a problem with the fan clutch, or the hose running from the solenoid to the fan clutch is pinched or damaged. Locate and repair the problem. Retest to be sure the problem has been corrected.

If air does not flow out of the solenoid discharge port, proceed to Test 19.

Test 11

Checking for air supply — KYSOR only

1.Crack the air supply line leading to the solenoid.

If air flows out of the supply line, proceed to Test 22.

If air does not flow out of the supply line, there is a blockage in the supply line or some other air system problem. Locate and repair the problem. Retest to be sure the problem has been corrected.