Why won't my 2000 Chevy Blazer's air condtioner turn off and will it affect my...

Faust II

New member
...gas mileage? The system is shut off, but I still feel air flowing through the vents very faintly as if it were still on? What is wrong, what can I do to fix this problem and if I don't get it fixed but switch it to have the heat on will it decrease my gas mileage? Please help me
 
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