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Click on image for the lowdown. 
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| | | Forums66 Topics128,167 Posts1,057,015 Members48,458 | | 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: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | yes and yes, the plenum is the part of the case the warm air flows up to the defrost vents - the 'thermal heater valve' is called a Ranco valve, should you wind up needing to hunt one down
Bill | | |
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