What operates the on board air compressor? I can't get mine on on 2000 GMC Envoy

The buttons don't seem to function

by in Hendersonville, NC on October 01, 2013
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2 answers
ANSWER by , October 02, 2013
agree with #1
ANSWER by , October 02, 2013
Have a mechanic check for a blown fuse, It seems nobody knows how to test the fuses anymore, so just have it done!