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air delivery for heater and ac doesn't air only blows out not vents
1999 Chevrolet Silverado 1500

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

(1999 Chevrolet Silverado 1500)
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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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General Diagnosis
$88 - $111 Learn More
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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