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What causes the ac air flow in a 1995 2500 GMV Vandura w 350ci eng to switch from the dash vents to the heater vents when you are pulling a steep hill The engine doesn't miss or have a loss of power?



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vent valve in the dash bad or vacum leak leading to it. What would your recommend on how to proceed to correct the problem? If the vent valve is bad does that have any adverse impact on the engine's performance? How can the valve be tested?