GMC Chevrolet Camaro 1998 Service Manual page 129

HVAC HVAC System - Manual 1-19
Blower Motor Operates at High Speed Only
Step
Action Value(s) Yes
No
Was the entire HVAC blower controls system check Go to HVAC
) 1
performed?
-
Blower Controls
Go to Step 2 System Check
1. Place the ignition switch in the RUN position.
2. Place the selector switch in the VENT position.
2
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
Backprobe with a test light between the blower motor relay
3
connector terminal 82 and ground.
-
Is the test light on? Go to Step 5
Go to Step 6
Replace the blower resistor. Refer to Blower Motor
4
Resistor Replacement
-
-
Is the repair complete? Go to Step 7
Replace the blower motor relay. Refer to Blower Motor
5
Relay Replacement
-
-
Is the repair complete? Go to Step 7
Repair the open in CKT 101 between the blower resistor
6
and the blower motor relay.
- -
Is the repair complete? Go to Step 7
1. Turn the ignition switch to the OFF position.
Go to HVAC
7
2. Reconnect all connectors/components removed.
-
Blower Controls
-
Have all the repairs been made? System Check
Blower Motor Inoperative in One Speed Only (High Speed Operates Normally)
Step Action
Value(s)
Yes No
Was the entire HVAC blowers controls system check Go to HVAC
1 performed?
-
Blower Controls
Go to Step 2 System Check
1. Disconnect the blower resistor connector.
2. Place the ignition switch in the RUN position.
3. Place the blower switch in the inoperative position.
2
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? Go to Step 3 Go to Step 4
Replace the blower resistor. Refer to Blower Motor
3
Resistor Replacement
- -
Is the repair complete? Go to Step 7
Backprobe with a test light between the HV AC control
4
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
Repair the open in the inoperative circuit
5
(L0=60, M1=63, M2=72).
-
-
Is the repair complete? Go to Step 7
Replace the HVAC control selector switch. Refer to
6
Control Assembly Replacement
-
-
Is the repair complete? Go to Step 7
) 1. Turn the ignition switch to the OFF position.
Go to HVAC
7
2. Reconnect all connectors/components disconnected.
-
Blower Controls
-
Have all repairs been made? System Check