my 1986 monte carlo heat & air only blows on drivers side on floor. on 1990 Chevrolet Blazer

how many air lines should be going to the controll panel from the engine compartment. right now there is 2 1 from vacume on carb. 1 from inline heater hose. do u have a web site that i can get answers on problems on older cars ? thanks for ur time

Asked by for the 1990 Chevrolet Blazer