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Air delivery for heater and ac doesn't air only blows out not vents

(1999 Chevrolet Silverado 1500)
in Tyler, TX on February 19, 2016
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Popular Answer
on February 19, 2016
raise the hood,start the engine,look/listen on the passenger side near the firewall,check the smaller vacuum hose for leaks.you may hear it hissing/leaking/sucking air.check all the vacuum hoses.could be a small leak or large,dry rot,split,collapsed,disconnected.when you find it,just cut it or splice into it,or replace it.vacuum hose/fittings are cheap at about any parts house.this is if the blower is working on all settings.if the blower is not coming on at all,then check the blower motor fuse/relay,if the fuse is not blown and relay is ok,then suspect the blower motor is bad.
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