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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: Dec 2015 Posts: 2,063 Big Bolt Forum Moderator | | Big Bolt Forum Moderator Joined: Dec 2015 Posts: 2,063 | I used a single valve on mine, it has 4 hose fittings on it so, it will bypass your heater core. It is vacuum operated so it is easy to turn on or off. We get plenty warm in the summer during the day but sometimes it is a bit chilly in the morning or evening an a bit of heat is nice. Or if it rains and I want the heat on for the defroster.
Napa 660-1294
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