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Blower issue

00Silverado4x4

By 00Silverado4x4
in Ask A GM Technician

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00Silverado4x4 Senior Enthusiast

00Silverado4x4

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I have been searching any haven't found anything, yet, but I'm having an issue with my blower fan. The fan is working but if I do any adjustments to temp or mode the blower quits blowing any from any of the vents. I end up having to shut off the truck for a while and then restart to work again. I replaced the mode actuator as the old one was not working and have confirmed the new one is cycling through the modes, but for whatever reason if I adjust the temp or mode more then once or twice in a run cycle the air quits coming out of any of the vents (defrost, floor, face or any combination in between.) Everything I've found points to the mode actuator which is now good. I'm at a loss right this moment. Any other ideas?

00Silverado4x4 Senior Enthusiast

00Silverado4x4

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I'll give it a try. Just weird because even when it's acting up I can crawl up under the dash and switch the modes and the actuator is moving full cycle. I know the temp door actuator will need to be replaced eventually, it makes all kinds of noise when switching temperatures.

00Silverado4x4 Senior Enthusiast

00Silverado4x4

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I went to meet a someone about a motorcycle engine/transmission that he was selling and on my way back the blower issue showed up again. So once I got home I disconnected the battery and left it off for about an hour, then reconnected. I didn't start the truck until this morning. I don't think the truck liked it much. It ran like crap and finally stalled after about 20 seconds of horrible idling. Restarted the truck and engine took off like normal with no further issues. Drove to work and didn't touch any AC controls for the drive (about 15 minutes total driving). Now to see if it possibly fixed the problem. More to follow.

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