GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1998 🢒 Firebird 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Blower Motor Inoperative in One Speed Only

Blower Motor Inoperative in One Speed Only High Speed Operates Normally

Step

Action

Value(s)

Yes

No

1

Was the entire HVAC blowers controls system check performed?

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Go to Step 2

Go to HVAC Blower Controls System Check

2
  1. Disconnect the blower resistor connector.
  2. Place the ignition switch in the RUN position.
  3. Place the blower switch in the inoperative position.
  4. Connect a test light from the blower resistor connector inoperative terminal (LO=B, M1=A, M2=D) to ground on the harness connector.

Is the test light on?

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Go to Step 3

Go to Step 4

3

Replace the blower resistor. Refer to Blower Motor Resistor Replacement

Is the repair complete?

--

Go to Step 7

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4

Backprobe with a test light between the HVAC control selector switch connector C1 of the inoperative terminal (LO=A, M1=C, M2=D) and ground.

Is the test light on?

Go to Step 5

Go to Step 6

5

Repair the open in the inoperative circuit (LO=60, M1=63, M2=72).

Is the repair complete?

Go to Step 7

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6

Replace the HVAC control selector switch. Refer to Control Assembly Replacement

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 disconnected.

Have all repairs been made?

Go to HVAC Blower Controls System Check

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