GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the HVAC System Check?

Go to Step 2

Go to HVAC System Check

2

Test for an open in the BLK/WHT wire between the blower motor and the blower motor resistor.

Is an open present?

Go to Step 6

Go to Step 3

3

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the blower speed selector switch.
  3. Move the blower speed selector switch to the MEDIUM 1 position.
  4. Test for an open between terminals 3 and 4 of the blower speed selector switch.
  5. Move the blower speed selector switch to the MEDIUM 2 position.
  6. Test for an open between terminals 3 and 8 of the blower speed selector switch.

Is an open present in any of the above tests?

Go to Step 4

Go to Step 5

4

Replace the blower speed selector switch. Refer to Blower Switch Replacement .

Is the repair complete?

Go to HVAC System Check

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5

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

Is the repair complete?

Go to HVAC System Check

--

6

Repair the open in the BLK/WHT wire between the blower motor resistor and S200. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to HVAC System Check

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