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Click on image for the lowdown. 
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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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| | | | Joined: Aug 2004 Posts: 1,067 Shop Shark | | Shop Shark Joined: Aug 2004 Posts: 1,067 | Never mind. I found it. https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=345645&page=1In short, the manual setting on the control valve sets the temperature that you want, and then the capillary tube has a diaphram inside that can restrict hot water flow further as the water temp changes (as truck warms up?), stabilizing the system and not requiring constant manual adjustment. In other words, it's an early version of an automatic control system. Interesing.
52 GMC 3/4 ton pickup
68 Big Block Vette
68 455 Firebird
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