GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire HVAC System Check performed?

--

Go to Step 2

Go to HVAC System Check

2

  1. Place the ignition switch in the RUN position.
  2. Place the heater-A/C control in position 1.
  3. Backprobe with a test light between the blower motor resistor connector terminal B and ground.

Is the test light on?

--

Go to Step 3

Go to Step 4

3

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

Is the repair complete?

--

Go to Step 5

--

4

Replace the heater-A/C control. Refer to Control Assembly Replacement .

Is the repair complete?

--

Go to Step 5

--

5

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors/components removed.

Have all the repairs been made?

--

Go to HVAC System Check

--