Cooling Fan Inoperative. Pontiac Vibe

GM Service Manual Online

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2005 🢒 Vibe - AWD 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Cooling Fan Inoperative

Cooling Fan Inoperative Inoperative in Low Speed

Table 1:

Reference Table

Symptom

Causes

Fan motor inoperative in both speeds

•	Open or short to ground in the fan 1 relay supply voltage circuits.

•	Open or short to B+ in the fan 1 relay coil control circuit.

•	Open or short to ground in the fan motor supply voltage circuit.

•	Short to ground in the fan 2 coil supply voltage circuit.

•	Open or short to B+ in the fan motor ground circuit.

•	Short to B+ in the fan 2 coil control circuit.

Fan motor inoperative in high speed only

•	Open in the fan 2 relay supply voltage circuit.

•	Open in the fan 2 relay coil control circuit.

•	Open in the fan 2 relay high speed ground circuit.

Fan motor low speed operates at high speed

•	Short to ground in the fan motor ground circuit.

•	Short to ground in the fan resistor circuit.

Fan motor inoperative in low speed only

Open or short to B+ in the fan resistor circuit.

Step	Action	Yes	No
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: The cooling fan motor is inoperative in low speed.
1	Did you review the Cooling System Description and Operation and perform the necessary inspections?	Go to Step 2	Go to Symptoms - Engine Cooling
2	Connect a scan tool. The engine must be below operating temperature. Use the scan tool to command the A/C compressor clutch relay ON. When the relay is energized the cooling fan will also run at low speed. Does the cooling fan operate at low speed?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Remove the fan 2 relay. Install a 30 amp fused jumper between the fan motor control circuit and the low speed fan circuit (between cavities 3 and 4) of the cooling fan 2 relay connector. Use the scan tool to command the A/C compressor clutch relay ON. When the relay is energized the cooling fan will also run at low speed. Does the cooling fan operate at low speed?	Go to Step 6	Go to Step 4
4	Test the low speed fan motor ground circuit for an open, or for a short to B+, between the fan 2 relay terminal 4 and S103. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 9	Go to Step 5
5	Inspect for a poor connection at the harness connector of the fan resistor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 9	Go to Step 8
6	Inspect for a poor connection at the harness connector of the fan 2 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 9	Go to Step 7
7	Replace the fan 2 relay. Refer to Cooling Fan Relay Replacement . Did you complete the replacement?	Go to Step 9	--
8	Replace the fan resistor. Did you complete the replacement?	Go to Step 9	--
9	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3

Cooling Fan Inoperative Inoperative in High and Low Speeds

Table 1:

Reference Table

Symptom

Causes

Fan motor inoperative in both speeds

•	Open or short to ground in the fan 1 relay supply voltage circuits.

•	Open or short to B+ in the fan 1 relay coil control circuit.

•	Open or short to ground in the fan motor supply voltage circuit.

•	Short to ground in the fan 2 coil supply voltage circuit.

•	Open or short to B+ in the fan motor ground circuit.

•	Short to B+ in the fan 2 coil control circuit.

Fan motor inoperative in high speed only

•	Open in the fan 2 relay supply voltage circuit.

•	Open in the fan 2 relay coil control circuit.

•	Open in the fan 2 relay high speed ground circuit.

Fan motor low speed operates at high speed

•	Short to ground in the fan motor ground circuit.

•	Short to ground in the fan resistor circuit.

Fan motor inoperative in low speed only

Open or short to B+ in the fan resistor circuit.

Step	Action	Yes	No
Schematic Reference: Engine Cooling Schematics . Connector End View Reference: Cooling System Connector End Views DEFINITION: The cooling fan motor is inoperative in both fan speeds.
1	Did you review the Cooling System Description and Operation and perform the necessary inspections?	Go to Step 2	Go to Symptoms - Engine Cooling
2	Run the engine until operating temperature is reached and the thermostat opens. Does the cooling fan operate?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Stop the engine. Disconnect the fan motor connector. Connect a test lamp across the fan motor connector. Start the engine. Does the test lamp illuminate?	Go to Step 11	Go to Step 4
4	Connect the fan motor. Exchange the fan 1 relay with a known good relay (the horn relay). Refer to Cooling Fan Relay Replacement . Does the cooling fan operate?	Go to Step 10	Go to Step 5
5	Test the fan 1 relay and the fan 2 relay supply voltage circuits for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 6
6	Test the fan 1 relay coil control circuit for an open or a short to B+. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 7
7	Test the fan 2 relay coil control circuit for a short to B+. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 8
8	Test the fan motor supply voltage circuit for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 9
9	Test the fan motor ground circuit for an open or a short to B+. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 12
10	Inspect for a poor connection at the harness connector of the fan 1 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 13
11	Inspect for a poor connection at the harness connector of the fan motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 14
12	Inspect for a poor connection at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 16	Go to Step 15
13	Replace the fan 1 relay. Refer to Cooling Fan Relay Replacement . Did you complete the replacement?	Go to Step 16	--
14	Replace the fan motor. Refer to Engine Cooling Fan Replacement . Did you complete the replacement?	Go to Step 16	--
15	Replace the PCM. Refer to Powertrain Control Module Programming and Setup in Programming and Setup. Did you complete the replacement?	Go to Step 16	--
16	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3

Cooling Fan Inoperative Inoperative in High Speed

Table 1:

Reference Table

Symptom

Causes

Fan motor inoperative in both speeds

•	Open or short to ground in the fan 1 relay supply voltage circuits.

•	Open or short to B+ in the fan 1 relay coil control circuit.

•	Open or short to ground in the fan motor supply voltage circuit.

•	Short to ground in the fan 2 coil supply voltage circuit.

•	Open or short to B+ in the fan motor ground circuit.

•	Short to B+ in the fan 2 coil control circuit.

Fan motor inoperative in high speed only

•	Open in the fan 2 relay supply voltage circuit.

•	Open in the fan 2 relay coil control circuit.

•	Open in the fan 2 relay high speed ground circuit.

Fan motor low speed operates at high speed

•	Short to ground in the fan motor ground circuit.

•	Short to ground in the fan resistor circuit.

Fan motor inoperative in low speed only

Open or short to B+ in the fan resistor circuit.

Step	Action	Yes	No
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: The engine cooling fan motor is inoperative in high speed.
1	Did you review the Cooling System Description and Operation and perform the necessary inspections?	Go to Step 2	Go to Symptoms - Engine Cooling
2	Run the engine until operating temperature is reached and the thermostat opens. Does the cooling fan operate at high speed?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Test the fan 2 relay coil supply voltage circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 4
4	Test the fan 2 relay coil control circuits for an open or for a short to B+. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 5
5	Remove the fan 2 relay. Install a 30 amp fused jumper between the fan motor control circuit and the high speed fan circuit (between cavities 3 and 5) of the fan 2 relay connector. Does the cooling fan operate at high speed?	Go to Step 7	Go to Step 6
6	Test for an open in the fan 2 relay high speed ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 8
7	Inspect for a poor connection at the harness connector of the fan 2 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 9
8	Inspect for a poor connection at the harness connector of the Powertrain Control Module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 10
9	Replace the fan 2 relay. Refer to Cooling Fan Relay Replacement . Did you complete the replacement?	Go to Step 11	--
10	Replace the PCM. Refer to Powertrain Control Module Programming and Setup in Programming and Setup. Did you complete the replacement?	Go to Step 11	--
11	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3

Cooling Fan Inoperative Low Speed Operates in High Speed

Table 1:

Reference Table

Symptom

Causes

Fan motor inoperative in both speeds

•	Open or short to ground in the fan 1 relay supply voltage circuits.

•	Open or short to B+ in the fan 1 relay coil control circuit.

•	Open or short to ground in the fan motor supply voltage circuit.

•	Short to ground in the fan 2 coil supply voltage circuit.

•	Open or short to B+ in the fan motor ground circuit.

•	Short to B+ in the fan 2 coil control circuit.

Fan motor inoperative in high speed only

•	Open in the fan 2 relay supply voltage circuit.

•	Open in the fan 2 relay coil control circuit.

•	Open in the fan 2 relay high speed ground circuit.

Fan motor low speed operates at high speed

•	Short to ground in the fan motor ground circuit.

•	Short to ground in the fan resistor circuit.

Fan motor inoperative in low speed only

Open or short to B+ in the fan resistor circuit.

Step	Action	Yes	No
Schematic Reference: Engine Cooling Schematics . Connector End View Reference: Cooling System Connector End Views DEFINITION: The cooling fan motor low speed operates at high speed.
1	Did you review the Cooling System Description and Operation and perform the necessary inspections?	Go to Step 2	Go to Symptoms - Engine Cooling
2	Connect a scan tool. The engine must be below operating temperature. Use the scan tool to command the A/C compressor clutch relay ON. When the relay is energized the cooling fan will also run at low speed. Does the cooling fan operate at high speed?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Remove the fan 2 relay. Use the scan tool to command the cooling fan ON. Does the cooling fan operate at high speed?	Go to Step 8	Go to Step 4
4	Test the fan 2 relay. The relay should be normally open between terminals 3 and 5 and normally closed between terminals 3 and 4. Did the relay test OK?	Go to Step 5	Go to Step 9
5	Test the fan 2 relay coil control circuits for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 12	Go to Step 6
6	Test the refrigerant pressure switch for a closed condition. The switch should be normally open between terminals 2 and 3. Did the switch test OK?	Go to Step 7	Go to Step 10
7	Inspect for a poor connection at the harness connector of the Powertrain Control Module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 12	Go to Step 11
8	Repair the short to ground in the fan motor ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 12	--
9	Replace the fan 2 relay. Refer to Cooling Fan Relay Replacement . Did you complete the replacement?	Go to Step 12	--
10	Replace the refrigerant pressure switch. Refer to Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement in Heating,Ventilation and Air Conditioning. Did you complete the replacement?	Go to Step 12	--
11	Replace the PCM. Refer to Powertrain Control Module Programming and Setup in Programming and Setup. Did you complete the replacement?	Go to Step 12	--
12	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3