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Test P: Too Cold In Vehicle - Cargo Van With Auxiliary HVAC

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Definition: The air temperature can not be adjusted from one or both auxiliary controls or auxiliary cooling is insufficient.
NOTE: For circuit reference, see CONNECTOR IDENTIFICATION  and/or WIRING DIAGRAMS  .
  1. If review of system operation has been performed, go to next step. If review of system operation has not been performed, see DESCRIPTION  and OPERATION  . Review HVAC operation and perform visual inspection of system. See OPERATION . If system inspection and review of operation has been performed, go to next step.
  2. Turn ignition on. Place auxiliary mode switch in any position except off. Place auxiliary blower switch in each speed position. If auxiliary blower motor operates in any speed position, go to next step. If auxiliary blower motor does not operate in any speed position, go to TEST I: BLOWER MOTOR INOPERATIVE - AUXILIARY .
  3. If auxiliary blower motor operates correctly for each speed position, go to next step. If auxiliary blower motor does not operate correctly for each speed position, go to TEST J: BLOWER MOTOR MALFUNCTION - AUXILIARY .
  4. Check cooling system for low coolant level, loose or worn accessory drive belt, leaking radiator or heater hoses, kinked radiator or heater hose, missing radiator cap pressure seal, and a leaking radiator cap. If any of these conditions were found, repair as necessary and go to step  17. If none of these conditions were found, go to next step.
  5. Start engine. Place mode switch in OFF, VENT or HEAT positions. If A/C compressor operates, go to TEST K: COMPRESSOR CLUTCH DOES NOT DISENGAGE . If A/C compressor does not operate, go to next step.
  6. While placing auxiliary air temperature switch from coldest position to warmest position, observe auxiliary air temperature actuator drive shaft. If auxiliary air temperature actuator drive shaft rotates at all, go to next step. If auxiliary air temperature actuator drive shaft does not rotate at all, go to step  8.
  7. Check auxiliary air temperature door for misaligned actuator, broken or binding door and/or linkage, obstructions preventing door from operating within its' full range, missing and/or misaligned door seals. If a door condition was found, repair as necessary and go to step  17. If a door condition was not found, go to next step.
  8. Check ignition 3 voltage circuit (Brown wire) of auxiliary air temperature door actuator for an open or high resistance. See WIRING DIAGRAMS . If an open or high resistance was found, repair as necessary and go to step  17. If an open or high resistance was not found, go to next step.
  9. Check ground circuit (Black wire) of auxiliary air temperature door actuator for an open or high resistance. See WIRING DIAGRAMS . If an open or high resistance was found, repair as necessary and go to step  17. If an open or high resistance was not found, go to next step.
  10. Check auxiliary air temperature door control circuit (Dark Green wire) for an open, high resistance, a short to ground, or a short to voltage. See WIRING DIAGRAMS . If a circuit problem was found, repair as necessary and go to step  17. If a circuit problem was not found, go to next step.
  11. Ensure auxiliary HVAC control assembly is properly connected. Turn ignition on. Using a DVOM, measure voltage between auxiliary air temperature door control circuit (Dark Blue wire) and ground, while placing auxiliary air temperature switch from coldest position to warmest position. See WIRING DIAGRAMS . If voltage ranges from zero-12 volts, with a smooth transition between COLD and HOT position, go to step  14. If voltage does not range from zero-12 volts, with a smooth transition between COLD and HOT position, go to next step.
  12. Check harness connector at auxiliary air temperature actuator for a poor connection. If a poor connection was found, repair as necessary and go to step  17. If a poor connection was not found, go to next step.
  13. Check auxiliary air temperature actuator, door and linkage for broken or binding conditions which prevents proper drive shaft rotation. If a door condition was found, repair as necessary and go to step  17. If a door condition was not found, go to step  15.
  14. Check harness connector at front auxiliary HVAC control assembly for a poor connection. If a poor connection was found, repair as necessary and go to step  17. If a poor connection was not found, go to step  16.
  15. Replace auxiliary air temperature actuator. See ACTUATORS  under REMOVAL & INSTALLATION. After repairs are complete, go to step  17.
  16. Replace front auxiliary HVAC control assembly. See FRONT AUXILIARY HVAC CONTROL ASSEMBLY  under REMOVAL & INSTALLATION. If replacement is complete, go to next step.
  17. Operate system to verify repair. If the condition was corrected, system is okay. If the condition was not corrected, return to step  2.
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