96 GMC SONOMA AC/HEATER CONTROLS DO NOT WORK

  • Tiny
  • gmcsonoma
  • 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.

Wednesday, June 20th, 2007 AT 3:55 PM

2 Answers

  • Tiny
  • danimalgmc
  • Member

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

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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