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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,086 Posts1,056,101 Members48,434 | | 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: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | If sweet_willy has a 1954 Chevrolet truck (as indicated in his profile) and he has a GM heater, it is either a recirculating heater or an Air Flow (or Fresh Air) heater. The hot water will not flow through the Fresh Air heater unless the valve is open; however, the heated water will continuously circulate through the Recirculating Heater, heating the cab. http://1954advance-design.com/Documents/Accessories/Booklet/Page1.jpg | | |
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