GM Service Manual Online
For 1990-2009 cars only

Blower Motor Always On Front

Step

Action

Value(s)

Yes

No

1

Did you review the Blower Controls Circuit Description and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

2

Verify that the front blower motor is always on.

Does the front blower motor operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the blower motor resistor.
  3. Check for a short to B+ in CKT 60, 63, 72, 73, or 52. Refer to Circuit Testing in Wiring Systems.

Is a short to B+ present?

--

Go to Step 4

Go to Step 5

4

Repair a short to B+. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 6

--

5

Replace the blower motor resistor. Refer to Blower Motor Resistor Replacement .

Is the repair complete?

--

Go to Step 6

--

6

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors /components removed.
  3. Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3

Blower Motor Always On Rear, With Ignition In RUN

Step

Action

Value(s)

Yes

No

1

Did you review the Blower Controls Circuit Description and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms

2

Verify that the rear blower motor is always on with the ignition switch in the RUN position.

Does the rear blower motor operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Turn the ignition switch to the RUN position.
  2. Turn both auxiliary blower switches to the OFF position.
  3. Disconnect the rear window wiper/washer and multi-function switch connector C2.

Does the auxiliary blower turn off?

--

Go to Step 4

Go to Step 5

4

Replace the rear window wiper/washer and multi-function switch. Refer to Auxiliary Air Conditioning (A/C) Control Assembly Replacement - Front .

Is the repair complete?

--

Go to Step 6

--

5

Repair a short to B+ in circuit 1176, 1072, or 1052. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 6

--

6

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors /components removed.
  3. Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3