Question about 2003 GMC Safari

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When switching the a/c on the blower comes on, but sometimes no air comes out of vents

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Ok start by check all the vents to see where the air is going then try changing the air flow if the air does not change from it's current location then you have a broken vacuum hose. The vacuum hose is plastic and just breaks apart, the hose is locate under the hood on the passenger side just look for a black plastic line or small hose coming up from the heater box and running along the or over the top of you alternator. The hose goes to the throttle body !

Posted on May 25, 2011

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Sounds like a blower motor resistor. Does it only do it at one speed or a couple or all

Posted on May 25, 2011

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Posted on Jan 02, 2017

SOURCE: heater blower does not come out vents

i had the same issue and it was the vacuum hose that goes over the alternator to the ac unit

Posted on Oct 30, 2008

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