Does anyone have the 1977 Buick HVAC service manual? or a 1978 shop manual? I have the 1977 Red & White shop manual but there may have been a service bulletin or change made.. Looking at the vacuum hose schematic in the manual...between the dash control and under dash programmer it shows different than what I'm looking at on the car. (1977 Riv) Mainly ports 6-7-8 on the programmer valve. The book shows #6 as open with brown to #7 and tan to #8. The car has #7 open with brown to #8 and tan to #6. Anyone have an updated schematic? 1978 should be the same system but maybe shows update? Thanks.
