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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,137 Posts1,056,747 Members48,454 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Dec 2013 Posts: 47 'Bolter | | 'Bolter Joined: Dec 2013 Posts: 47 | It's both. The knob pulls a cable to mechanically open a vent and it turns clockwise for low, med, hi blower.
Yes, I wonder about the set screw??? if it will hold or not.
Gee...... I wonder if a a good JB weld would hold it tight? | | |
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