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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 25 (HVAC SYSTEMS - AUTOMATIC)SYMPTOM TESTSTEST P: TEMPERATURE VARIATION BETWEEN DRIVER AND PASSENGER OUTLETS
2004 Oldsmobile Bravada AWD

Test P: Temperature Variation Between Driver And Passenger Outlets

2004 Oldsmobile Bravada AWDSECTION Test P: Temperature Variation Between Driver And Passenger Outlets
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.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing system check, go to next step.
  2. Connect scan tool. Turn ignition on. Using scan tool, perform RECALIBRATE ALL MOTORS command in INSTRUMENT PANEL MODULE SPECIAL FUNCTIONS. Observe current DTC list in instrument panel module. If scan tool displays DTCs, see DIAGNOSTIC TROUBLE CODE INDEX  table under SELF-DIAGNOSTIC SYSTEM. If no DTCs exist, go to step  8.
  3. Connect scan tool. Place right air temperature switch in middle position. Place auto switch in OFF position. Using scan tool, observe LEFT AND RIGHT TEMP DOOR ACTUAL parameters in HVAC Door Positions data list. Place air temperature switch from coldest position to warmest position. If operating range of Left Temp Door Actual parameter is near the operating range of Right Temp Door Actual parameter, go to next step. If operating range of Left Temp Door Actual parameter is not near the operating range of Right Temp Door Actual parameter, see TEMPERATURE IS TOO HOT IN VEHICLE  test.
  4. Connect scan tool. Place air temperature switch in middle position until temperature display indicates 75°F (24°C). Using scan tool, observe RIGHT TEMP DOOR COMMANDED parameter. Place right air temperature switch from coldest position to warmest position. If Right Temp Door Actual parameter changes, go to next step. If Right Temp Door Actual parameter does not change, see PASSENGER HVAC CONTROL DOES NOT OPERATE PROPERLY  test.
  5. If problem occurs when A/C is on, go to next step. If problem occurs when A/C is not on, go to step  13.
  6. With ambient air temperature above 38°F (3°C), cover Sunload Sensor assembly. Start engine. Fully open all panel outlets. Select coldest position. Place mode switch in panel (upper) position and Blower Motor switch at maximum speed. Place Passenger Air Temperature Switch in Neutral position. Verify that vent (ambient air) indicator is not illuminated. If difference between right and left center panel outlet temperatures are greater than 10°F (6°C), go to next step. If difference between right and left center panel outlet temperatures are 10°F (6°C), or less, system is okay.
  7. Perform A/C system performance test. See A/C SYSTEM PERFORMANCE  under SYSTEM TESTS. If problem is found and corrected, go to step  26. If no problem is found, go to next step.
  8. Inspect upper and lower right and left Air Temperature Sensors for proper installation. See AIR TEMPERATURE SENSORS  under REMOVAL & INSTALLATION. If problem is found and corrected, go to step  26. If no problem is found, go to next step.
  9. Connect scan tool. Cover Sunload Sensor Assembly. Start engine. Select temperature 75°F (24°C). Place air temperature switch in Neutral position. Using scan tool, observe RIGHT and LEFT SOLAR DATA parameters in INSTRUMENT PANEL MODULE OPEN/SHORT data list. If scan tool indicates RIGHT and LEFT SUNLOAD SENSOR DATA parameters are more than 224 counts, go to next step. If scan tool indicates RIGHT and LEFT SENSOR DATA parameter is 224 counts or less, go to step  21.
  10. 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, go to step  21.
  11. Place thermometer near Inside Air Temperature Sensor and upper and lower right and left Air Temperature Sensors. Using scan tool, observe DATA parameter 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°C to -3°C) of thermometer readings, system is okay.

    If scan tool readings are not within 5°F to -5°F (3°C to -3°C) of thermometer readings, go to step  19.

  12. Cover Sunload Sensor assembly. Start engine. Fully open all panel outlets. Select warmest temperature position. Place mode switch in floor (lower) position. Place Blower Motor switch in maximum speed position. Place passenger-side temperature control switch in Neutral position. If difference between right and left outlet temperatures is greater than 10°F (6°C), go to next step. If difference between right and left outlet temperatures is not greater than 10°F (6°C), system is okay.
  13. Inspect cooling system for low coolant level, leaking or kinked heater or radiator hoses, loose or warn drive belts or leaking radiator cap or missing cap seal. Correct any problems found, go to step  26. If no problems were found, go to next step.
  14. Check heating system performance. See HEATING SYSTEM PERFORMANCE  under SYSTEM TESTS. Correct any problems found, go to step  26. If no problems were found, go to next step.
  15. Inspect upper and lower right and left Air Temperature Sensors for proper installation. See AIR TEMPERATURE SENSORS  under REMOVAL & INSTALLATION. Correct or repair any problems found, go to step  26. If no problems were found, go to next step.
  16. 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 SOLAR SENSOR DATA parameters in INSTRUMENT PANEL MODULE OPEN/SHORT data list. If scan tool indicates that RIGHT and LEFT SOLAR 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, go to step  21.
  17. Uncover Sunload Sensor. Direct a light source at right and left side of sensor assembly. If count changes are similar from one Sunload Sensor to the other, go to next step. If count changes are not similar from one Sunload Sensor to the other, go to step  21.
  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°C to -3°C) of thermometer readings, system is okay at this time. If scan tool readings are not within 5°F to -5°F (3°C to -3°C) of thermometer readings, go to next step.
  19. Check for loose wires and/or poor connections at harness connector of suspected sensor. If poor connection is found, repair as necessary. When repairs are complete, go to step  26. If poor connection is not found, go to next step.
  20. Test suspect air temperature sensor resistance. See SENSOR RESISTANCE  table under A/C SYSTEM DOES NOT MAINTAIN SET TEMPERATURE test. If resistance measurement is near sensor resistance value, go to step  22. If resistance measurement is not near sensor resistance value, go to step  24.
  21. Check for loose wires and/or poor connections at Sunload Sensor assembly. If poor connection is found, repair as necessary. When repairs are complete, go to step  26. If poor connection is not found, go to step  23.
  22. Check for loose wires and/or poor connections at IPM. See INSTRUMENT PANEL MODULE (IPM)  under REMOVAL & INSTALLATION. If poor connection is found, repair as necessary. When repairs are complete, go to step  26. If poor connection is not found, go to step  25.
  23. Replace Sunload Sensor assembly. See SUN LOAD SENSOR  under REMOVAL & INSTALLATION. When repairs are complete, go to step  26.
  24. Replace suspect Air Temperature Sensor. See AIR TEMPERATURE SENSORS  under REMOVAL & INSTALLATION. When repairs are complete, go to step  26.
  25. Replace IPM. See INSTRUMENT PANEL MODULE (IPM)  under REMOVAL & INSTALLATION. When repairs are complete, go to step  26.
  26. Operate system to verify repair. If condition is corrected, system is okay. If condition is not corrected, go to step  4.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
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