Mercury Cougar Cool
Join Date: Jul 2003
Location: Brisbane Australia
A/C distribution at low vacuum
Have a problem on the XG (efi) that when I'm running up a hill for too long that the vacuum keeping the a/c running through the vents drops to a point where the air circulation switches to demist - the default
I know on my early 70's Cougars there is a small can in the heater control system to retain vacuum in the line.
Is this a common problem or do I have something wrong in the HVAC system? i would suspect it would be common across XE and XF as well?
68 Cougar XR7 (302W), 69 Cougar Convertible(302W), 70 Cougar XR7 Convertible (428CJ), 70 Cougar Eliminator (351 4V), 77 Cougar Villager Waggon, XY Ute (302W), XG Ute (IL6 XR6 replica)