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Click on image for the lowdown. 
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| | | Forums66 Topics128,012 Posts1,055,313 Members48,419 | | 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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | There were two 1954 Chevrolet truck heaters: - Recirculating heater - Air Flow (Fresh Air) heater (both names were used in different GM documents) GMC had both of those styles of heaters and a few other style heaters. The little door allows you to heat differing amounts of cab air (for faster heating?) and/or outside air (for dryer/fresher air?). | | |
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