AC stops blowing when going uphill?
So the blower fan stops not the AC?
Or the blower fan stays on but AC gets warm?
Or the blower fan stays on, AC stays cold but Blend Door closes stopping air flow thru vents?
AC compressor is suppose to shut off when gas pedal is at full throttle, can't change that one.
Since you think it is a vacuum issue check the vacuum reservoir(VRES on diagrams), it usually looks like a ball with vacuum hoses attached, this "ball" holds a vacuum for use when engine is under load and vacuum in intake is low, if it isn't holding a vacuum then vacuum operated devices would quit when "going uphill"
Last edited by RonD; 05-30-2015 at 09:31 PM.