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Click on image for the lowdown. 
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| | | Forums66 Topics128,038 Posts1,055,471 Members48,424 | | 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: Apr 2009 Posts: 159 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 159 | Thanks Dads50! The pictures and the link sure help. From them I figure the capillary tube fine tunes the opening of the heater valve depending on the ambient temperature in the cab.
Is there any way to test the capillary tube for proper functioning?
Craig
It is neither wealth nor splendor, but tranquility in occupation which brings happiness. - Thomas Jefferson
CK
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