Question about 1998 Chevrolet Tahoe
The AC works fine but the air will not flow thru the dash vents, all other functions work fine but the dash vents Any Ideas?
Find outlet selection motor (between accelerator & HVAC case). With ignition "off" unplug connector from motor, after 30 second lapse reconnect. Turn ignition switch "on", observe white gear & linkage for smooth motion. Smooth motion: You're in luck. No motion: GENTLY rotate white gear by hand. If motion begins; lube linkage with lithium grease. If still no motion: remove HVAC control head, unplug connector & clean circuit board connector strip. Reconnect & Retry. Lastly, outlet selection motor may have failed, requiring its R&R (lotsa fun!).
Posted on Jun 17, 2008
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Posted on Jan 02, 2017
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It's most likely a vacuum line, look
under your hood (close to the cowl panel) for a disconnected, cracked
or broken vacuum line.
In some rear cases, it could be the
vacuum switch (in dash). Or vacuum diaphragm (under dash).
Hope this helps you ???
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