HAC Valve
Remove hoses or caps from top of HAC valve. Blow into valve upper port. If air passes through, valve is in high altitude position. If not, valve is in low altitude position. Replace valve if position does not correspond to altitude.
Remove hoses or caps from top of HAC valve. Blow into valve upper port. If air passes through, valve is in high altitude position. If not, valve is in low altitude position. Replace valve if position does not correspond to altitude.