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96 GMC Sonoma AC/heater controls do not work

Tiny
GMCSONOMA
  • MEMBER
  • 1996 GMC SONOMA
I have a 96 gmc sonoma with 189k miles, and the swith contorl for the heater and ac goes on but it only blows out of the defrosters and floorboards. Both the heat and a/c work fine but the controls do not change where the vents blow out of. Thanks for the help.
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Wednesday, June 20th, 2007 AT 3:55 PM

2 Replies

Tiny
DANIMALGMC
  • MEMBER
  • 33 POSTS
It sounds like you lost a vacuum hose under the dash somewhere. The vacuum controls the mechanism that controls the air flow selection.
You might be able to here the vacuum.
And if you;'re a smoker, blow smoke under the dash and follow it.
Or bad control valve
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Monday, June 25th, 2007 AT 10:18 AM
Tiny
GMCSONOMA
  • MEMBER
  • 2 POSTS
I'll try that, thanks for the help, I hope it works, its kind of annoying.
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Monday, June 25th, 2007 AT 12:31 PM

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