A/C - Updated Performance Test - Service Stall
BULLETIN NO.: 99-T-54ISSUE DATE: October, 1999
GROUP/SEQ. NO.: HVAC-10
CORPORATION NO.: 99-01-37-011
SUBJECT:
Service Manual Update for All the 2000 L-Series HVAC Service Manuals
MODELS AFFECTED:
2000 Saturn L-Series Sedans and Wagons
PURPOSE:
The purpose of this bulletin is to update all the 2000 L-Series HVAC Service Manuals at your location.
Obtain all the 2000 L-Series HVAC Service Manuals at your location and update as indicated below.
a) Cross out page 21 and 22 with a marker or pen.
b) Remove this front page from staple in upper corner.
c) Insert revised procedure provided with this bulletin between pages 20 and 21.
PERFORMANCE TEST - SERVICE STALL
IMPORTANT:
If ambient air temperature is lower than 0°C (32° F), A/C compressor will not be enabled.
IMPORTANT:
This test must be performed in a service stall environment that protects vehicle from wind that could cause incorrect pressure/temperature readings.
1. Open hood and leave open during entire test.
2. Install a manifold gauge set to high and low side service ports.
3. Start engine.
4. Turn A/C Off - A/C button indicator light Off.
5. Depress re-circulation button so that indicator light is On.
6. Install thermometer into right center outlet.
7. Set mode knob to I/P outlet position - full counter-clockwise.
8. Set temperature knob to full cold position - full counter-clockwise.
9. Set blower to third speed - M2.
10. Open both front doors and windows to stabilize interior air temperature with outside ambient temperature.
IMPORTANT:
A Tech 2 with version 19.007 or higher software is required to perform this test.
11. Connect Tech 2 to data link connector (DLC).
12. Using the Tech 2, verify engine is operating at thermostat control temperature - ECT is 188° F or greater.
13. Use the appropriate Tech 2 special function to set engine cooling fan speed to medium.
^ For L81 engines:
a. Select Fan Control 1 and press enter.
b. Command fan control On. Display should indicate fans are operating at MED.
c. Turn A/C On - A/C button indicator light On.
IMPORTANT:
Allow A/C system pressures to stabilize before beginning test.
d. Using throttle, increase engine speed to 2000 rpm and hold.
^ On L61 engines:
a. Select HVAC Performance special function and press enter. Display should indicate fans are operating at MED.
b. Turn A/C On - A/C button indicator light On.
IMPORTANT:
Allow A/C system pressures to stabilize before beginning test.
c. Using Tech 2, increase engine speed to 2000 rpm.
14. Record A/C system pressures and outlet temperature every minute for 5 minutes.
15. Release throttle to return engine to idle.
16. Release Tech 2 control of engine cooling fans by exiting Tech 2 special function.
17. Compare recorded values to system performance charts then continue down diagnostic flow chart.
PERFORMANCE TEST - 72 KM/H (45 MPH) ROAD TEST
1. Install a manifold gauge set to high and low side service ports and route hoses so that gauges can be read from inside vehicle with hood closed.
2. Start engine.
3. Turn A/C Off - A/C button indicator light Off.
4. Select outside air - re-circulation button indicator light is Off.
5. Install thermometer into right center outlet.
6. Set mode knob to I/P outlet position - full counter-clockwise.
7. Set temperature knob to full cold position - full counter-clockwise.
8. Set blower to third speed - M2.
IMPORTANT:
A Tech 2 with version 19.007 or higher software is required to perform this test.
9. Connect Tech 2 to data link connector (DLC).
10. Using the Tech 2, verify engine is operating at thermostat control temperature - ECT is 188 F° or greater.
11. Use the appropriate Tech 2 special function to set engine cooling fan speed to medium.
^ For L81 engines:
a. Select Fan Control 1 and press enter.
b. Command fan control On. Display should indicate fans are operating at MED.
c. Turn A/C On - A/C button indicator light On.
^ On L61 engines:
a. Select HVAC Performance special function and press enter. Display should indicate fans are operating at MED.
b. Turn A/C On - A/C button indicator light On.
IMPORTANT:
Allow A/C system pressures to stabilize before beginning test.
12. Drive vehicle at 72 km/h (45 mph).
13. Record A/C system pressures and outlet temperature every minute for 5 minutes.
14. Release Tech 2 control of engine cooling fans by exiting Tech 2 special function.
15. Compare recorded values to system performance charts then continue down diagnostic flow chart.