Question about 1996 GMC Suburban

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97 gmc suburban air wont come out front vents only bottom and defroster?

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Check for vacuum leak under hood on passegers side ,replace vacuum tubing even if it looks ok could be pinched or pin hole u cant see vacuum going from eng compartment to inside firewall

Posted on Jun 28, 2009

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Posted on Jan 02, 2017

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Have 97 gmc suburban. Heat blows out vents an floor when I switch to defrost it jus stays on vents. Passanger side will defrost verry slow. Half of driver side will not defrost. What could b issue?


Dear Aaron,
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.

Jan 02, 2017 | 1997 GMC Suburban

1 Answer

I have air coming out of my defrost and heat, but not hot air, but have hot air going to the rear heat. 2003 GMC Savana


You have either a blend door problem,or the blend door actuator. Both are located underneath the dash.

Sep 23, 2012 | 1992 GMC Suburban

1 Answer

My heat wont blow out my vents just my defrost vents and it wont switch from ac to heat in my 97 gmc jimmy whats the problem


blend door sticking not sure if this year has an electronic actuator for the door or not

Sep 19, 2012 | 1997 GMC Jimmy

1 Answer

The front air isn't blowing hard through the vents but some air is blowing through the defrost


The vents are not working properly. most run off of vaccum and that sounds like your problem. could also be the controls. suburbans are famous for this.

Aug 12, 2012 | 1996 Chevrolet Suburban

1 Answer

My 95 jeep grand cherokee wont blow air out of the front vent only on bottom vent and defrost


Most of the time the problem is that the upper hose that feeds the air to the vents has fallen off and is blowing air somewhere else.

Jun 09, 2009 | 2003 GMC Envoy

1 Answer

Air wont blow out of the front vents only the defrost vents


Not sure about your exact model but a lot of these are vacuum actuated. If one of the vac lines is broken, leaking or disconnected this will happen. Maybe take look under the dash to see if something is obvious while you try to switch it - look and listen, good luck.

Mar 29, 2009 | 2003 GMC Sierra

1 Answer

1996 GMC Suburban heater blows on floor


yes those controls are vacuum controlle. Could be as simple as a bad hose or connection.

Feb 18, 2009 | 1999 Chevrolet Suburban

1 Answer

Defrost vent door wont open


sounds like you have a vaccum leak or a blockage in the blend door area of the HVAC system most of the doors are controlled by vacuum if not by vacuum on of the servo motors that control the blend door is not functuning properly. Hopr this is helpfull

Jan 17, 2009 | 1993 GMC Suburban

1 Answer

Air Vents 2003 Envoy


I have the same ploblem, I just wonder why this is not a recall yet? the other problem i got is the fuel gauge not working.

Aug 02, 2008 | 2003 GMC Envoy

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