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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: Jan 2019 Posts: 2,242 Herder of Cats, Goats, and Sheep (moderator) | | Herder of Cats, Goats, and Sheep (moderator) Joined: Jan 2019 Posts: 2,242 | As I think about it more, I recall having a hard time figuring out the correct way to hook it up.
The way mine is plumbed, when it is not activated, it connects the inlet and outlet so it forms a loopback to the engine and isolates the heater core.
Could you have it backwards so that the loopback is on the heater core side and you are dead-heading the engine side? That would cause significantly higher pressures on its inlet side and could be blowing them out. | | |
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