Question about 1995 Chevrolet Astro

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1997 Astro van 4.3 liter A/C problem

Hello, I’m Eddie from California.
I have a 1997 Chevy Astro van and when I have my A/C on and accelerate the upper vents go of and the bottom goes on, when I reduce acceleration the upper vents go back on, What do you think the problem is?

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You should have a vacuum canister under the hood that holds vacuum when you accelerate it may have a leak that is causing your concern

Posted on Sep 22, 2008

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You are right to be concerned about this behavior since it can definitely increase your stopping distance.
Either your cable has eaten its way into the inner tubing and is hanging up, or the mechanics at the throttlebody needs some lubrication.
With no engine running, have someone inside to press on the accelerator while you watch for movement of the linkage under the hood. Once you have located it, operate it by hand to see how it feels. If the linkage does not return to the stops provided, then use a heavy-duty penetrating oil to soak the moving parts. If it still hangs, then the cable needs replacement.
With the engine running, tranny in Park and the parking brake on, after you have lubed the visible linkage, have some one inside press on the gas and watch the linkage to see if it now returns to the mechanical stop. Carefully move it by hand to see if it is truly at the limits of its travel where it should be at an idle.

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