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2000 GMC Jimmy

Question: why does my truck blow air from the vents when blower is turned off?

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Visitor, Smiths Creek, MI, October 16, 2010, 11:35

I have a 2000 GMC jimmy.why does air blow out of heat vents when blower motor is turned off? When you change the temputre to hot or cold it gets hot or cold just blows air when blower is turned off. help plz

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  • Answer #1

    AllstateAz from Allstate Transmission and Auto Repair, October 16, 2010, 13:02
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    I'd check to make sure that when you select "recirculation" from "outside air", that the door that controls the air flow is closing all the way. The actuator could be bad or the door itself could be stuck partially open. Sometimes things left on the dash can fall down through the defrost vents and cause all kinds of issues. Let me know if this helps, Jeff

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    Visitor, October 16, 2010, 21:28

    Thanks 4 the reply. you were part of the way right .I trouble shot for hours and after checking all the vacuum lines under the dash.For all the vacuum bladders come to find out that good old Gm. Has a vacuum line that runs your four wheel drive and your heat vacuum also.After tracing the line Come to find out this vacuum line runs to a little black box.Located in the drivers fender by the master cylinder. needless to say my hose was disconnected.so the selector door was stuck on dash vent all the time. Thanks again Dave

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