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HVAC control question


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I tried it and they work fine and quickly without it... I was worried that maybe there would be too much vacuum

 

There's no such thing as too much vacuum. It can only reach an equal force of 14.7 psi, but as an inward force rather than an outward force.

 

The only thing I would be worried about is if your car was a turbo model, in that case, you could probably route the lines to the brake booster past the one-way valve so you'll almost always have vacuum.

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