Question about 1997 GMC Suburban
Your heater and air conditioner assemblies are partly vacuum actuated.
The parts underneath the dash are also largely plastic.
Many, if not most of the time, either there is a vacuum leak ( that you
probably cannot hear) or a plastic part that is sticking or has broken. Those parts like that are usually inside the housing & ductwork under the dashboard on the right side also under the glove box.
God bless your efforts.
Posted on Jan 02, 2017
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Posted on Jan 02, 2017
If you have climate controls that are "slide type" knobs...likely that the cable that controls the diverter panel in the blower box is broken....
Posted on Feb 27, 2009
I assume you have the dual climate control feature on your truck. it sounds like you have door problems. The heating system has several doors inside the box and duct work that divert the air from defrost to face and feet...i'm not 100% sure if the ones in your truck are electronic or vaccum, but i think they are electronic. From time to time the actuators that control the door go out, as every electric motor does. You need to find the ones that have quit and replace them. It is possible that the arm(s) on the actuator(s) have broken loose from the doors and are working but not pushing or pulling the doors properly...if might help to remove the front seats...just to help save your back....working under the dash is hard on your body....and it take a good half day to remove the dash, so working under it is actually less work.
Posted on Mar 13, 2009
either a vacumn pipe is broken or the ends split so its not passing a vacumn to open the flaps,where they are and how to get to them i cant help because i have never worked on one as they are not here in spain.check the engine end first though .Look for some small rubber pipes running from the inlet manifold
Posted on May 30, 2009
Sounds like the driver's side temperature actuator or blend door are defective. Part of the dash needs to be removed to access these parts.
Posted on Nov 03, 2011
It is either the servo door could be blocked by something like a pencil falling through or something falling and blocking it from opening. Or it is actually broken. I have seen them both ways. Mine was actually broken in my Ford F250. You should still take it in to someone who can deal with it for you.
Posted on Apr 09, 2012
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