My rear vents are stuck open and wont close
Remove rear seat belt bolt, remove upper rear panel, splice vent motor wires. Use 12 volt power supply to close. I used battery charger kepp closed so you can wash and keep rain and snow out.
SOURCE: 2000 pontiac montana air conditioner driver side
That is correct, the air blend door actuator. "flapper valve" may need to be replaced or cleaned and free from binding up. Good luck and hope this helps. If there is an Auto Zone in your area, they can order the part you need and give you the step by step instructions to removing the old actuator and replacing it if it's damaged. Good luck and keep me posted, be glad to help.
SOURCE: 2003 pontiac montana key wont turn first time this
the tumblers in the ignition cylinder is jambed.
replace the lock cylinder to fix this problem
SOURCE: How do I install a rear wiper motor on 2003 Pontiac Montana?
Here's a great video that will show you how to install the rear wiper motor on a 97-05 Montana or Venture">
SOURCE: Rear windows on 2003 Montana won't close, now
If the lockout switch on drivers door is "OFF"... Window fuse's and relay's may be up under passenger side dash or behind glove box.
Could also be a broken wire in the rubber boot going from the door to the body. You will have to eliminate each till you find the culprit.
The motor and the relay are the most likely to cause this problem. Try swapping the relay with a working window relay. If it still doesn't work, remove the door panel and remove the window motor.
Turn the motor shaft in both directions by hand several turns. Then plug the motor in and see if the switch will now run the motor. Sometimes thats all it takes to get it working again. I have had to do this with brand new motors. If voltage is not present at the motor connector, either a bad switch or a broken wire exsists. Make sure to check for voltage coming to that windows switch. Actually, GM use's a circuit breaker type relay for each window and one fuse for all the circuit breakers.
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