Schematic Reference: HVAC Schematics

DEFINITION: The condenser fan motor runs continuously.

1

Did you review the HVAC operation and perform the necessary inspections?

Go to Step 2

Go To Symptoms - HVAC Systems - Manual

1. Start the engine.
2. Place the blower switch in the ON position.
3. Place the A/C switch in the ON position.

Does the A/C clutch engage?

Go to Step 3

Go to HVAC Compressor Clutch Does Not Engage

1. Disconnect the condenser fan relay.
2. Turn ON the ignition, with the engine OFF.
3. Connect test lamp to battery positive voltage circuit of the condenser fan relay to a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 13

Connect a 10-amp fused jumper wire between the battery positive voltage circuit on the switch side of the condenser fan relay and the condenser fan motor supply voltage circuit of the condenser fan relay.

Does the condenser fan motor turn ON?

Go to Step 5

Go to Step 11

1. Start the engine.
2. Turn the blower switch to the ON position.
3. Turn the A/C switch to the ON position.
4. Connect a test lamp between the control circuit of the condenser fan relay and the condenser relay control circuit of the condenser fan relay.

Does the test lamp illuminate?

Go to Step 19

Go to Step 6

Probe the battery positive voltage circuit on the coil side of the condenser fan relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 14

1. Connect the condenser fan relay.
2. Connect a 3-amp fused jumper between the condenser relay control circuit of the condenser fan relay and a good ground.

Does the condenser fan motor turn ON?

Go to Step 8

Go to Step 19

1. Turn ON the ignition, with the engine OFF.
2. Disconnect the A/C high pressure switch.
3. Connect a 3-amp fused jumper between the condenser relay control circuit of the A/C high pressure switch and a good ground.

Does the condenser fan motor turn ON?

Go to Step 9

Go to Step 15

1. Start the engine.
2. Connect a 3-amp fused jumper between the condenser relay control circuit of the A/C high pressure switch and the A/C request circuit of the A/C high pressure switch.

Does the condenser fan motor turn ON?

Go to Step 10

Go to Step 16

1. Connect the A/C high pressure switch.
2. Start the engine.
3. Perform the Cooling Insufficient Air Conditioning Inoperative Diagnostic. Refer to Cooling Insufficient - Air Conditioning (A/C) Inoperative .

Did you find and correct the condition?

Go to Step 25

Go to Step 20

1. Disconnect the condenser fan motor.
2. Connect a test lamp between the condenser fan motor supply voltage circuit of the condenser fan motor and the ground circuit of the condenser fan motor.

Does the test lamp illuminate?

Go to Step 21

Go to Step 12

Probe the condenser fan motor supply circuit of the condenser fan motor with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 18

Go to Step 17

Test the battery positive voltage circuit on the switch side of the condenser fan relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 25

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Test the battery positive voltage circuit on the coil side of the condenser fan relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 25

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Test the condenser relay control circuit of the A/C high pressure switch for an open, high resistance, or short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 25

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Test the A/C request circuit of the A/C high pressure switch for an open, high resistance, or short to voltage. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 25

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Test the condenser fan motor supply voltage circuit of the condenser fan motor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 25

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Test the ground circuit of the condenser fan motor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 25

--

Inspect for poor connections at the harness connector of the condenser fan relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 25

Go to Step 22

Inspect for poor connections at the harness connector of the A/C high pressure switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 25

Go to Step 23

Inspect for poor connections at the harness connector of the condenser fan motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

Did you find and correct the condition?

Go to Step 25

Go to Step 24

Replace the condenser fan relay.

Did you complete the repair?

Go to Step 25

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Replace the A/C high pressure switch. Refer to Air Conditioning (A/C) High Pressure Switch Replacement .

Did you complete the repair?

Go to Step 25

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Replace the condenser fan motor. Refer to Condenser Fan Replacement .

Did you complete the repair?

Go to Step 25

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2