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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,140 Posts1,056,776 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!
| | THANKS!
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: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | A heater was an accessory (non-factory installed).
GM and others sold accessory heaters (some looked like a square box).
Some heaters were heater/defroster, some were just heaters; some were just defrosters; and some were bolt-together component - heater and/or defroster. | | |
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