HVAC System - Automatic - Aurora: Adjustments Oldsmobile Aurora II

TEMPERATURE SETTING REQUIRES FREQUENT ADJUSTMENT

1. Perform diagnostic system check. See «DIAGNOSTIC SYSTEM CHECK»(ref-91547-S34777884642001040900000) under TROUBLE SHOOTING. After performing system check, go to next step.
2. Turn engine off. Connect scan tool. Cover sunload sensor. Start engine. Select temperature 75°F (24°C). Place air temperature switch in neutral position. Using scan tool, observe RIGHT AND LEFT SUNLOAD SENSOR DATA parameters in INSTRUMENT PANEL MODULE OPEN/SHORT data list. If scan tool indicates that RIGHT and LEFT SUNLOAD SENSOR DATA parameters are 224 counts or more, go to next step. If scan tool indicates that RIGHT and LEFT SUNLOAD SENSOR DATA parameters are less than 224 counts, check for loose wires and/or poor connections at sunload harness connector. Repair as necessary and go to step 8 . If wires and connectors are okay, replace sunload sensor, see «SUN LOAD SENSOR»(ref-91547-S18469500342001042400000) under REMOVAL & INSTALLATION and go to step 8 .
3. Uncover sunload sensor. Direct a light source at right and then left side of sunload sensor assembly. If sunload sensor counts correspond to proper side of sunload sensor, go to next step. If sunload sensor counts do not correspond to proper side of sunload sensor, check for loose wires and/or poor connections at sunload sensor assembly. Repair as necessary and go to step 8 . If wires and connectors are okay, replace sunload sensor assembly and go to step 8 .
4. Open all instrument panel outlets completely. Select panel mode. Set blower speed to maximum. Check airflow through inside of air temperature sensor, by placing a 2" (5 cm) square piece of paper over inside of sensor inlet. If paper stays in place, go to next step. If paper does not stay in place, inspect for a blocked or disconnected aspiration hose. Repair as necessary and go to step 8 .
5. Inspect upper and lower right and left air temperature sensors for proper installation. See «AIR TEMPERATURE SENSORS»(ref-91547-S37006549882001042400000) under REMOVAL & INSTALLATION. Correct or repair any problems found and go to step 8 . Inspect upper and lower right and left air temperature sensors for intermittent loose wires and/or poor connections. Repair as necessary and go to step 8 . If no problems were found, go to next step.
6. Check resistance in upper and lower, right and left air temperature sensors. See «SENSOR RESISTANCE»(ref-91547-S09641971632001042000000) table under A/C SYSTEM DOES NOT MAINTAIN SET TEMPERATURE. If any sensor is not within specifications, replace faulty air temperature sensor and go to step 8 . If all sensors are within listed resistance values, check for loose wires and/or poor connections to ambient air temperature sensor. Repair as necessary and go to step 8 . If all wiring and connectors are okay, test ambient air temperature sensor resistance. If resistance is okay, go to next step. If resistance is not okay, replace ambient air temperature sensor, see «AMBIENT AIR TEMPERATURE SENSOR»(ref-91547-S37932928542001042400000) under REMOVAL & INSTALLATION and go to step 8 .
7. Inspect inside air temperature sensors for loose wires and/or poor connections. Repair any problems found. If wires and connections are okay, test both inside air temperature sensors for resistance. See «SENSOR RESISTANCE»(ref-91547-S09641971632001042000000) table under A/C SYSTEM DOES NOT MAINTAIN SET TEMPERATURE. If air temperature resistance is not okay in both sensors, replace faulty inside air temperature sensor, see «INSIDE AIR TEMPERATURE SENSOR»(ref-91547-S11790020442001032600000) under REMOVAL & INSTALLATION and go to step 8 .
8. Start engine. Verify all instrument panel outlets are open. Operate all system functions. If no problems are found, system is okay at this time. If any problems are found, perform appropriate symptom test.