2001 Chevy Venture hot air stuck in one vent

Tiny
TOM22544
  • MEMBER
  • 2001 CHEVROLET VENTURE
  • 6 CYL
  • 2WD
  • MANUAL
  • 190,000 MILES
I can't get the hot air to blow on the windshield. It blows through the vents, but it doesn't change to windshield when I turn the switch. It seems the air pressure (or vacuum) is not there to move the air flow. How hard is it to get to it?
Thanks
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Wednesday, March 24th, 2010 AT 12:43 AM

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Tiny
DAVE H
  • EXPERT
On 2001 models, control of airflow through system is regulated by electrically operated actuators. Several A/C-heater control panel settings are possible to provide desired comfort level. See Fig. 1. The available mode settings are as follows:

AIR DELIVERY IMPROPER (MAIN SYSTEM)
2001 Models
Perform A/C-HEATER SYSTEM DIAGNOSTIC SYSTEM CHECK. Go to next step.
Turn ignition switch to ON position. Place main blower motor switch in OFF position. If main blower motor continues to operate, go to MAIN BLOWER MOTOR ALWAYS ON. If main blower motor does not operate, go to next step.
Place main blower motor switch in each speed position. If main blower motor operates in any speed position, go to next step. If main blower motor does not operate, go to MAIN BLOWER MOTOR INOPERATIVE AT ANY SPEED.
If blower motor operates in all speed positions, go to next step. If main blower motor does not operate in all speed positions, go to MAIN BLOWER MOTOR MALFUNCTIONS.
Except for main blower motor speed, if all other A/C-heater functions are inoperative, go to step 14. In addition to main blower motor speed, if any other A/C-heater functions are operative, go to next step.
Place blower motor switch in maximum speed position. Place mode switch in VENT position. Place recirculation air switches in outside air then recirculation air positions. If recirculation door moves to correct position for each switch selection, go to next step. If recirculation door does not move to correct position for each switch selection, go to AIR RECIRCULATION MALFUNCTION.
Place main blower motor switch in maximum speed position. Place mode switch in each mode position. If airflow is sufficient and from correct outlet, problem is intermittent. Check for poor connections or faulty wiring. Repair or replace as necessary. After repair, go to step 23. If no problem is found, go to next step.
Inspect air delivery system for Obstruction to air flow, dirty A/C-heater air filter (if equipped) or misaligned air ducts. If any of these conditions exist, repair or replace as necessary. After repair, go to step 23. If no problem is found, go to next step.
Inspect mode door and mode actuator for misaligned actuator or binding linkage, obstructions limiting actuator or door operation, or missing or misaligned mode door seals. If any of these conditions exist, repair or replace as necessary. After repair, go to step 23. If no problem is found, go to next step.
Turn ignition switch to OFF position. Disconnect mode actuator harness connector. Turn ignition switch to ON position. Using test light connected to ground, probe mode actuator harness connector terminal No. 10 (Brown wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 20.
Check Black wire for high resistance or open between ground and mode actuator harness connector terminal No. 7. Repair Black wire as necessary. After repair, go to step 23. If wire is okay, go to next step.
Using DVOM connected to ground, measure voltage at mode actuator harness connector terminal No. 8 (Tan wire). While observing voltage, place mode switch in each switch position. Compare actual voltage readings with specified voltages. See MODE ACTUATOR VOLTAGE table. If indicated voltages are about specified levels, go to step 18. If indicated voltages are not about specified, go to next step.
MODE ACTUATOR VOLTAGE
Mode Switch PositionIndicated Voltage
Vent0.2
Bi-Level3.0
Floor6.0
Mix-Blend9.0
Defrost12.0

Check Tan wire between mode actuator harness connector terminal No. 8 and A/C-heater control panel harness connector C2 terminal A7 for high resistance, open, short to voltage or short to ground. Repair Tan wire as necessary. After repair, go to step 23. If wire is okay, go to step 19.
Check Brown wire for high resistance or open between DRL/HVAC/TEMP/HDT ST fuse (10-amp) located in fuse block under right side of dash and A/C-heater control panel harness connector C2 terminal A2. Repair Brown wire as necessary. After repair, go to step 23. If wire is okay, go to next step.
Check Orange wire for high resistance or open between RADIO fuse (10-amp) located underhood fuse block and A/C-heater control panel harness connector C2 terminal A1. Repair Orange wire as necessary. After repair, go to step 23. If wire is okay, go to next step.
Check Black wire for high resistance or open between ground and A/C-heater control panel harness connector C2 terminal B1. See WIRING DIAGRAMS. Repair Black wire as necessary. After repair, go to step 23. If wire is okay, go to next step.
Check Dark Green wire for short to voltage between A/C-heater control panel harness connectors C1 terminal "A" and C2 terminal B5. Repair Dark Green wire as necessary. After repair, go to step 23. If wire is okay, go to step 19.
Check for poor connections or connector damage at mode actuator harness connector. Repair or replace as necessary. After repair, go to step 23. If connections are okay, go to step 21.
Check for poor connections or connector damage at A/C-heater control panel harness connectors. Repair or replace as necessary. After repair, go to step 23. If connections are okay, go to step 22.
Repair Brown wire between mode actuator harness connector terminal No. 10 and A/C-heater control panel harness connector C2 terminal A2. After repair, go to step 23.
Replace mode actuator. See MODE ACTUATOR & DOOR under REMOVAL & INSTALLATION. After repair, go to step 23.
Replace A/C-heater control panel. See A/C-HEATER CONTROL PANEL under REMOVAL & INSTALLATION. After repair, go to next step.
Operate A/C-heater system to verify repair. If air delivery system operates correctly, repair is complete. If air delivery system does not operate correctly, return to step 8.
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Wednesday, April 21st, 2010 AT 4:19 AM

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