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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!
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| | | | Joined: Apr 2009 Posts: 554 'Bolter | | 'Bolter Joined: Apr 2009 Posts: 554 | It sounds like you have the recirculating type of heater. You can screw an on-off valve into the engine outlet. May be possible to somewhat regulate the heat by opening it like a garden valve but that would involve stopping and adjusting it underhood. I added the valve shown in the linked picture with a cable to adjust flow or shut it off. I don't think it matters which hose goes to which fitting. The water just makes a loop. http://i99.photobucket.com/albums/l286/Hookalatch/Heater/IMG_1752.jpg | | |
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