GMC chervolet camaro 1999 Service Manual page 113

t-22 HVAC System - Manual HVAC
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 Step2
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 te_st 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 Steps Go to Step 6
Replace the blower resistor. Refer to Blower Motor
4
Resistor Replacement
-
-
Is the repair complete? Goto·Step 7
Replace the blower motor relay. Refer to Blower Motor
5
Relay Replacement
-
-
.·
-··
. Is the repair complete?
Go to Step7
Repair the open in CKT 101 between the blower resistor
I
6
and the blower motor-relay.
- -
'
Is the repair complete?
Goto
si~p
7-
'
'
1. Turn the ignition switch to the OFF position.
Goto HVAC
'
.7
2. Reconnect all connectors/components removed.
-
Blower Qontrols
-
Have alt 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 toHVAC
1 performed?
-
'
Blower Controls·
Go to Step2
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 toStep3 Go to Step4
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 HVAC 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.
Goto HVAC
7
2. Reconnect all connectors/components disconnected.
-
Blower Controls
-
Have all repairs been made?
System Check