Ford V10. On long grades before it downshifts the A/C will stop blowing out the vents. As far as I can tell it's not diverting to the floor but it might be going to defrost. As soon as the load on the engine drops off it come back to the dash vents. A/C works fine except for this.
Is this likely a vacuum leak? If yes where to start looking? (that engine has lots and lots of rubber hoses)
thx to anyone taking the time to offer advice.
mark in MN
Is this likely a vacuum leak? If yes where to start looking? (that engine has lots and lots of rubber hoses)
thx to anyone taking the time to offer advice.
mark in MN