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my a/c will only blow cold air on the number 4 setting and only if its set on the defrost option. air will not blow through any other vents. also the heater will not blow any warm air on any setting. the a/c worked fine until i put the car in the shop to get the timing belt replaced. the heat hasnt worked since i got the car in april. does anyone know what could cause these to quit working?
james
james