GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Heater Blower Controls System Check?

Go to Step 2

Go to Heater Blower Controls 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 OFF.
  2. Disconnect the blower speed selector switch.
  3. Move the blower switch to the MEDIUM 1 position.
  4. Test for an open between the blower speed selector switch terminals 3 and 4.
  5. Move the blower switch to the MEDIUM 2 position.
  6. Test for an open between the blower speed selector switch terminals 3 and 8.

Is an open present?

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 Heater Blower Controls System Check

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5

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

Is the repair complete?

Go to Heater Blower Controls 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 Heater Blower Controls System Check

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