Test O: Temperature Is Too Hot In Vehicle

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM. After performing system check, go to next step.
Connect scan tool. Turn ignition on, engine off. Perform RECALIBRATE ALL MOTORS command in INSTRUMENT PANEL MODULE SPECIAL FUNCTIONS menu. Observe current DTC list in instrument panel module. If scan tool displays any DTCs, see DIAGNOSTIC TROUBLE CODE INDEX table under SELF-DIAGNOSTIC SYSTEM. If no DTCs are found, go to next step.
Connect scan tool. Turn ignition on. Command A/C ORIFICE RELAY, in DASH INTEGRATION MODULE, ON and OFF. If A/C Orifice Solenoid turns ON and OFF with each command, go to next step. If A/C Orifice Solenoid does not turn ON and OFF with each command, see DUAL-STAGE ORIFICE MALFUNCTION test.
Place blower motor switch in each position. If Blower Motor operates in any position, go to next step. If Blower Motor does not operate in any position, see BLOWER MOTOR DOES NOT OPERATE IN ANY MODE test.
Verify Blower Motor operates in each position. If Blower Motor operates in each position, go to next step. If Blower Motor does not operate in each position, see BLOWER MOTOR MALFUNCTION test.
With ambient air temperature above 38°F (3°C), cover sunload sensor, start engine and fully open all panel outlets. Select fully cold position. Place blower motor switch in maximum speed position. Place mode switch in panel (upper) position. Verify vent (ambient air) indicator is not illuminated. If A/C clutch engages, go to next step. If A/C clutch does not engage, see COMPRESSOR CLUTCH DOES NOT ENGAGE test.
Check A/C system performance. See A/C SYSTEM PERFORMANCE under SYSTEM TESTS. Correct any condition found. If condition was found and corrected, go to step 23. If no condition is found, go to next step.
Inspect upper and lower right and left Air Temperature Sensors for proper installation. See AIR TEMPERATURE SENSORS under REMOVAL & INSTALLATION. Correct or repair any problem found. If condition was found and corrected, go to step 23. If no problems were found, go to next step.
Start engine. Fully open all panel outlets. Adjust temperature setting to 75°F (24°C) position. Place mode switch in panel (upper) position. Set blower speed so 2 bars illuminate on fan speed indicator. Place air temperature switch in Neutral position. Inspect airflow through inside air temperature sensor by placing a 2" (5 cm) square piece of paper over sensor air inlet. If paper stays in place, go to next step. If suction does not hold paper in place, go step 14.
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 parameters are less than 224 counts, go to step 18.
Uncover Sunload Sensor. Direct a light source at right and left side of sensor assembly. If count changes are similar from one side to the other of sunload sensor, go to next step. If count changes are not similar from one side to the other of Sunload Sensor, go to step 18.
Place thermometer near Inside Air Temperature Sensor and upper and lower right and left Air Temperature Sensors. Using scan tool, observe DATA parameters in INSTRUMENT PANEL MODULE HVAC SENSOR data list for INSIDE AIR TEMP, RIGHT A/C DUCT TEMP, LEFT A/C DUCT TEMP, LEFT A/C DUCT TEMP, RIGHT HTR DUCT TEMP and LEFT HTR. DUCT TEMP. If scan tool readings are within 5°F to -5°F (3° to -3°C) of thermometer readings, go to next step.
If scan tool readings are not within 5°F to -5°F (3°C to -3°C) of thermometer readings, go to step 15
If customer needs to adjust temperature frequently to maintain comfort, see A/C SYSTEM DOES NOT MAINTAIN SET TEMPERATURE test. If customer does not need to change set temperature frequently to maintain comfort, go to step 17.
Inspect for a blocked or disconnected Aspirator Hose. Correct any damage found. When repairs are complete, go to step 23.
Check for loose wires and/or poor connections at harness connector for suspected sensor. If poor connection is found, repair as necessary. When repairs are complete, go to step 23. If no poor connection is found, go to next step.
Test suspect sensor. See SENSOR RESISTANCE table under A/C SYSTEM DOES NOT MAINTAIN SET TEMPERATURE test. If sensor tests okay, go to step 19. If sensor does not test okay, go to step 20.
Connect scan tool. Turn ignition ON, engine OFF. Using scan tool, adjust TEMPERATURE OFFSET IN INSTRUMENT PANEL MODULE SPECIAL FUNCTION/SET OPTIONS as necessary. When completed, go to step 23.
Check for loose wires and/or poor connections at sunload harness connector. If poor connection is found, repair as necessary. When repairs are complete, go to step 23. If wires and connectors are okay, go to step 21.
Check for loose wires and/or poor connections at IPM. If poor connection is found, repair as necessary. When repairs are complete, go to step 23. If wires and connectors are okay, go to step 22.
Replace suspect sensor. See AIR TEMPERATURE SENSORS under REMOVAL & INSTALLATION. When repairs are complete, go to step 23.
Replace Sunload Sensor. See SUN LOAD SENSOR under REMOVAL & INSTALLATION. When repairs are complete, go to step 23.
Replace IPM. See INSTRUMENT PANEL MODULE (IPM) under REMOVAL & INSTALLATION. When repairs are complete, go to next step.
Operate system to verify repair. If condition is corrected, system is okay. If condition is not corrected, go to step 2.