Heater & AC control panel
check the vacum hoses and vac tank.
I have the same problem with a c cold air coming out the bottom foot vents in a 92 gmc Sonoma. I checked the vac lines and vac ball under the hood and everything looked normal. I don' t know where the lines or flipper valves are under the dash or how to get to them. If anyone can please advise me also.
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