GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire HVAC blower controls system check performed?

Go to Step 2

Go to HVAC Blower Controls System Check

2

  1. Place the ignition switch in the RUN position.
  2. Place the selector switch in the VENT position.
  3. Place the blower switch in the LO position.
  4. Backprobe with a test light between the blower resistor connector terminal C and ground.

Is the test light on?

Go to Step 3

Go to Step 4

3

Backprobe with a test light between the blower motor relay connector terminal B2 and ground.

Is the test light on?

Go to Step 5

Go to Step 6

4

Replace the blower resistor. Refer to Blower Motor Resistor Replacement

Is the repair complete?

Go to Step 7

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5

Replace the blower motor relay. Refer to Blower Motor Relay Replacement

Is the repair complete?

Go to Step 7

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6

Repair the open in CKT 101 between the blower resistor and the blower motor relay.

Is the repair complete?

Go to Step 7

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7

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

Have all the repairs been made?

Go to HVAC Blower Controls System Check

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