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My 2000 gmc truck is stuck in defrost and wont engage into ant other mode butblows a/c through defroster

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Check for broken vacuum lines

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My heat on blows from the defrost how do i fix?


The heat/vent blend door that is located inside of the HVAC system behind dash..Rarely it is the control however it could be....Some of the vent door issues are recalls on certain vehicles."Also Blend vent door actuators that operate the doors can become inoperable...If it is the door inside the HVAC it will probably take about 8 hours to repair...Most vent doors either stick shut and or break..as well as actuators....Only a Dealer Scanner can tell exactly where the problem is.....

Feb 22, 2015 | 2008 Jeep Liberty

1 Answer

Defrost and floor heat broke


Are you saying you don't have blower at all? Defrost, floor and panel are the only three separate modes you have. If it's not blowing at all and the fuses are good, check the wiring behind the glove box. There's a two wire plug with a large red wire just about center of the glove box opening that's known for burning out. If it is you'll see the burned spot on the connector or wont be able to disconnect it.

Jan 01, 2014 | 1999 GMC Sierra

1 Answer

04 yukon blower stuck in defrost


Bring to shop since you obviously do not know what you are doing.

Jan 29, 2013 | 2003 GMC Yukon Denali

1 Answer

The compressor clutch ti is engaging with heat mode, normal?


Depends.
The compressor will run when the control is in defrost, but should not in heat mode. In defrost mode the compressor runs to dry the air blowing onto the windshield.

Dec 13, 2012 | 2003 Toyota ECHO

1 Answer

94 deville concours ac works sometimes then u here duct door close and digital climate temp numbers go to blank dashes and defrost comes on and is stuck wont turn off then digital numbers come back on


My first guess would be a wiring problem or the controller.
If anything goes wrong with the system, it will default to the defrost mode for safety.

Jul 10, 2012 | Cadillac Cars & Trucks

1 Answer

My ac and heater are stuck in defrost and i cant figure out why i turn the dial to vents and heat but it stays in defrost


It all depends on whether your truck is equipped with Automatic Climate Control or Manual HVAC. You could have a broken control head assembly a broken mode door cable, a failed electronic mode door actuator, a broken mode door, or a loose or broken wire or connector.

To put it simply, your mode doors are not swithching modes - the reason for this can vary depending on which system you have.

Nov 14, 2011 | 1999 Chevrolet Silverado 1500

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The upper air vents will not open so only the floor ones and the defrost will work


{: ) It is possible that the mode actuator is malfunctioning, and this is usually the cause in most cases. It can also be a stuck or binding mode actuator door.
Sometimes the wirings and connectors can give problems. If the signals do not reach the actuator properly, the control sysytem will assume a default mode position, and air will flow only to the floor and defrost vents.
Check carefully your climate control settings.

Oct 14, 2010 | 2006 GMC Envoy

2 Answers

2004 Gmc Envoy when I put on the heater it wants to stall any ideas?


problem with ac compessor most likley when in defrost mode ac compressor will be working creating a major load on engine and cause it to stall

Jan 15, 2010 | 2004 GMC Envoy

1 Answer

2004 gmc 1500 sierra heater control stuck on


Defrost is the default position. Is the control a autyomatic temperture control unit? ( you set the temp and select automatic) if it is the system is completely electronic. You push the buttons and the control still says defrost or can you select something else and the control shows it but it just keeps coming out the defrost? If the control changes and the air comes out the defrost anyway and the cheack engine light isn't on, then the problem can be blown fuses or an air door actoater not working. Does the dash emit a clicking sound? if it does with the covers off the bottom of the dash reach around touching the different pieces till you touch the idem that is clicking. this is an acutor motor, or blend door motor. they have gears in them that wear out and break the motors aren't repairable and you just replace the ofending motor. the door that is moves can be stuck. and may have to be freed up with blaster, WD40, or other rust buster till it moves easy. maybe after getting the door to move smoothly you can get the old motor to move the door wiithout having to install a new one.

Jan 06, 2010 | 2000 GMC Sierra

1 Answer

A/c and heater only blow air out of defrost


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

May 30, 2009 | 2005 GMC Sierra 1500 Hybrid

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