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Discussion Starter · #1 ·
I'm having a problem with my front AC vents not blowing when I turn the AC on. If I turn the rear AC vents on from the front controls and the rear controls, the vents in the back will blow and blow cool air. I have had a problem before the front vents completely shut off in which the front vents would blow on settings 1-4 but the AC would shut off on the highest setting of #5. Now the vents in the front do not blow at all. Please give any suggestions that I can try before spending a fortune at a shop. I am very capable and resourceful. Thanks.
 

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2004 gmc
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Sounds like you have problems both with the blower speed control resistor pack, and an airflow mode actuator. Both of those can be fixed at home, but the actuator is more difficult for access. Run a search and you can find recent threads discussing both of them. Welcome!

Most of them will not be in the Audio forum, so I'll move this thread to General Tech, where it's discussed more.

There are also fuses involved, and those are mentioned in the troubleshooting hints in the other threads.
 
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