GMC Chevrolet Camaro 1998 Service Manual page 140

1-30 HV AC System - Manual HVAC
Low Side Pressure (cont'd)
Step Action
Value(s)
Yes No
1. Recover the refrigerant. Refer to Refrigerant
15
Recovery and Recharging.
- -
2. Inspect the expansion (orifice) tube.
(
Is the expansion (orifice) tube plugged? Go to Step 16
Remove and clean or replace the expansion (orifice) tube
16
as necessary. -
-
Is the repair complete?
Go to Step 17
Recharge the A/C system. Refer to Refrigerant Recovery
Go to the
17
and Recharging.
-
System
Is the repair complete? System OK Performance
Control Valve
Step Action Value(s) Yes No
DEFINITION: The VDOT control valve is inoperative.
Were you sent here from the Low Side Pressure Go to the
1 Diagnostic Table? - System
Go to Step 2 Performance
1. Connect high and low side pressure gages.
2. Close all the vehicle doors and windows.
3. Run the engine at 2000 rpm for 5 minutes.
172-241 kPa
2
4. Set the A/C control to the MAX A/C mode.
(25-35 psi)
5. Set the temperature control to full cold.
6. Set the blower motor speed on low.
Go to the System
Is the low side pressure within the value(s) shown. Performance Go to Step 3
1. Recover the refrigerant. Refer to Refrigerant
(
3
Recovery and Recharging.
-
-
2. Replace the control valve.
Is the repair complete? Go to Step 4
Recharge the A/C system. Refer to Refrigerant Recovery
Go to the
4
and Recharging.
-
System
Is the repair complete? System OK Performance
Heating Insufficient
Step Action
Value(s)
Yes No
Important: Insufficient heating may be caused by the following conditions:
• A low coolant level
• A faulty thermostat
• A partially or fully clogged heater core or heater hose
• An obstruction to air curculation
• An air leak past a faulty seal into the passenger compartment
Inspect for the following conditions:
• Low coolant level
• Loose or 'worn belts
1
• Leaking or kinked hoses
-
• Missing radiator cap pressure seal
Are any of these conditions present?
Repair as necessary.
Is the repair complete? System OK Go to Step 2
(