HVAC Blower Motor Inoperative and/or Blower Speed is Higher/Lower than Requested Speed (Replace HVAC Control Assembly)
| Subject: | HVAC Blower Motor Inoperative and/or Blower Speed Is Higher/Lower Than Requested Speed (Replace HVAC Control Assembly) |
| Models: | 2003 ION Vehicles Built Up To and Including VIN Breakpoint 3Z161066 |
| Attention: | General Manager, Fixed Operations Manager, Parts Manager, Technician |
Condition:
Some customers may comment on two possible conditions:
| • | The HVAC blower motor switch may be inoperative. |
| • | Blower speed is higher or lower than requested speed (for example, blower may run at speed 1 when switch is in speed 4 position). |
Cause:
If the blower motor fan switch is rotated rapidly, the switch contacts may come out of position, causing the blower motor to become inoperative or to operate at a different speed.
Correction:
Replace HVAC control assembly.
Service Procedure
- Identify condition affecting vehicle, if any.
- After repairs are complete, verify that blower motor performs properly.
| • | If the HVAC blower motor switch is inoperative, refer to the Diagnostic Table "Blower Motor Inoperative" in the 2003 Saturn ION HVAC Service Manual. This table is reproduced on page 2 for your reference. |
| • | If the blower speed is higher or lower than requested speed, refer to the Diagnostic Table "Blower Motor Malfunction" in the 2003 Saturn ION HVAC Service Manual. This table is reproduced on page 3 for your reference. |
Blower Motor Inoperative
The number below refers to the step number on the diagnostic table.
4. The blower motor supply voltage circuit is the High speed blower motor control circuit. A short to ground on the control circuits will open the Run fuse. Be sure to check all the blower motor control circuits for a short to ground.
6. There are two ignition 3 voltage supply circuits going to the HVAC control assembly. Test the one that supplies the blower motor switch.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The blower motor is inoperative in all speed positions. | |||
1 | Did you perform the HVAC Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - HVAC Systems - Manual |
2 |
Does the blower motor operate in any speed position? | Go to Blower Motor Malfunction | Go to Step 3 |
3 |
Does the test lamp illuminate? | Go to Step 5 | Go to Step 4 |
4 | Test the blower motor supply voltage circuit for an open, short to ground or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 6 |
5 | Test the blower motor ground circuit for an open, or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 7 |
6 | Test the ignition 3 voltage supply circuit of the HVAC control assembly for an open, short to ground or high resistance. 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 poor connections at the blower motor. Refer to Testing for Intermittent 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 poor connections at the HVAC control assembly. Refer to Testing for Intermittent 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 blower motor. Refer to Blower Motor Replacement in Heating Ventilation and Air Conditioning. Did you complete the replacement? | Go to Step 11 | -- |
10 | Replace the HVAC control assembly. Refer to HVAC Control Assembly Replacement. 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 2 |
Blower Motor Malfunction
The number below refers to the step number on the diagnostic table.
3. Test the Low, Med 1, Med 2 and High blower motor control circuits for an open short to voltage, short to ground or high resistance. The High blower motor control circuit uses the Body Control Module (BCM) as a junction block. Be sure to check all three High blower motor control circuits.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The blower motor operates in at least one, but not all, speed positions. | |||
1 | Did you perform the HVAC Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - HVAC Systems - Manual |
2 |
Does the blower motor operate at the desired speeds? | Go to Testing for Intermittent and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the test lamp illuminate on all blower motor control circuits? | Go to Step 5 | Go to Step 4 |
4 | Test the applicable blower motor control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
5 | Test each blower motor control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the blower motor resistor assembly. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the HVAC control assembly. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
8 | Replace the blower motor resistor. Refer to Blower Motor Resistor Replacement in Heating, Ventilation and Air Conditioning. Did you complete the replacement? | Go to Step 10 | -- |
9 | Replace the HVAC control assembly. Refer to HVAC Control Assembly Replacement. Did you complete the replacement? | Go to Step 10 | -- |
10 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Parts Information
Part Number | Description |
|---|---|
22718842 | Control Assembly -- Heater only |
22718843 | Control Assembly -- Heater and A/C |
Claim Information
To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System for D0362 (Control Assembly, A/C -- Replace), or D0360 (Control Assembly, Heater -- Replace).
