adding manual ball valve to heater inlet hose

eran tomer · Jan 24, 2022

on tbi. pros and cons?
so you can shut the heating circuit when heating is not needed, and thus enhance the a/c performance, because an old air box is never sealed enough and hot and cold air are mixing.
most cars i know have some sort of a valve, not just a flap.

GoToGuy · Jan 24, 2022

And most valves eventually leak or fail in some way.

454cid · Jan 24, 2022

eran tomer said:
on tbi. pros and cons?
so you can shut the heating circuit when heating is not needed, and thus enhance the a/c performance, because an old air box is never sealed enough and hot and cold air are mixing.
most cars i know have some sort of a valve, not just a flap.

I have one that I intend to install on my Vortec 454, but have not done so, yet. It should be fine as long as the engine doesn't rely on the heater circuit to act as a coolant bypass, and our engines do not. I think you bypass is internal to the water pump, and block. Mine is a short hose from the pump to the intake manifold.

yevgenievich · Jan 24, 2022

There is a vacuum operated bypass valve that gm used for that purpose. Keeps coolant circulation when in bypass.

eran tomer · Jan 24, 2022

yevgenievich said:
There is a vacuum operated bypass valve that gm used for that purpose. Keeps coolant circulation when in bypass.

in which models?

yevgenievich · Jan 24, 2022

eran tomer said:
in which models?

15-5533 ac Delco
Suburbans, and various other gm vehicles used them. I added one to my old 91 suburban and would just remove the vacuum source in winter.

adding manual ball valve to heater inlet hose

eran tomer

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GoToGuy

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454cid

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yevgenievich

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eran tomer

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yevgenievich

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