Heater/air louvers and defrost outlets not working

Tiny
RED94GMCZ71
  • MEMBER
  • GMC C1500
My '94 GMC K1500 Z71 4x4, 54k actual miles -- Air conditioning/heat louvers and defrost outlets seem to be stuck. I get a little air going through the defrost vent on the dash, the air vents on the dash, and a little coming out of the floor vent. No matter how I move the instruments I cannot get much air flow. Blower seems to be working fine, just can get the air to come out where needed.

How do I check this? Do I need to removed the dash? Are there vacuum hoses that control the louvers?
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Saturday, August 12th, 2006 AT 9:47 AM

3 Replies

Tiny
MIKEYBDMAN
  • MEMBER
Looks like this one may be electric. Send me an email with your make model year and engine type and I will email you the trouble shooting guide to help you find the problem.
Michael.D. Byers@delta. Com
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Sunday, August 13th, 2006 AT 4:14 PM
Tiny
ELGENCO
  • MEMBER
I have the same problem with my 1994 Jimmy,
Please post on forum what you found when you find
and fix trouble thanks
elgenco
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Monday, August 14th, 2006 AT 2:32 PM
Tiny
MIKEYBDMAN
  • MEMBER
Each vehicle will have simular systems to control the air vents in your car or truck. They are usually either electrically controlled, ot vacuum controlled motors that control air doors to direct air flow to the selected ducts in the cabin.
I find in a lot of vacuum systems, a leak, or disconnected hose between the vacuum tank and the control motors can cause the air doors to go to their spring loaded position. Usually defrost, or a combo of defrost and vent.
On the electrical controlled motor system, you will need to find out of the control motor itself has gone bad. In either case, there can be instructions that can aid in the trouble shooting of the system. But a blanket set of guide lines is not going to work for each type of car. If you post a specific model, yerar make and type of engine. Sedan and coupe 2 wheel and 4 wheel drive, allows me to look up your specific system and maybe allow me to help you diagnose your problem. But each one will be type specific.
Send emails to me, but include all of the details of the problem, and everything you have tried to fix it. You can email me and link me to a post and we can communicate so it may help others with the same problem, but email is the only wany I can send images you might need to trouble shoot.
Michael.D. Byers@delta. Com
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Monday, August 14th, 2006 AT 2:58 PM

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