GMC chervolet camaro 1999 Service Manual page 131

1-40 HVAC System .. Manual
HVAC
Temperature Control Inoperative
Step Action Value{s) Yes
No
1. Turn off the blower.
1
2. Test the temperature control effort.
-
Is the proper effort required? System OK
Go to Step 2
2
Determine if excessive effort is required.
-
Is excessive effort required?
Go to Step 3 Go to Step 12
Inspect the cable for the following conditions:
• The improper routing
• A kink
3
-
• Wiring interference
• IP interference
Do one of these conditions exist?
Go to Step 13 Go to Step 4
1. Remove the cable from the temperature valve.
4
2. Cycle the valve manually.
-
3. Inspect the valve for binding.
Is there valve binding?
Go to Step 10 Go to Step 5
5
Inspect for control binding.
-
Is there control binding? Go to Step 6
Go to Step B
1. Remove the cable.
6
2. Inspect for control binding.
-
Is there control binding? Go to Step 7
Go to Step 9
Replace the control. Refer to Control Assembly
7
Replacement.
- -
Is the replacement complete? System OK
1. Reinstall the cable.
(
8
2. Inspect the clearances to the dash components.
- -
Is the inspection complete? System OK
Replace the cable(s). Refer to Temperature Control Cable
9
Replacement.
-
-
Is the replacement complete? System OK
1. Lubricate the valve.
10
2. Retest the valve for binding.
-
Does the valve bind? Go to Step 11 System OK
1. Inspect the temperature valve for the following
conditions:
• Shaft alignment
11
• A bent shaft
- -
• A bent valve
• A warped case
2. Repair any of these conditions.
Is the repair complete?
System OK
1. Remove the cable from the control.
12
2. Inspect the control in order to see if the control has
-
detents.
Does the control have detents? Go to Step 13
Go to Step 14
Replace the cable. Refer to Temperature Control Cable
13
Replacement. - -
Is the replacement complete? System OK
Replace the control. Refer to Control Assembly
14
Replacement.
-
-
(
Is the replacement complete? System OK