Question about 1999 Chevrolet Silverado 1500

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Vent door sticks

When i try to switch to temp to cold it doesn't get cold. the doors that switch the temps are stuck. how do i fix it

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  • Chevrolet Master
  • 14,380 Answers

Could be just stuck or it may be bad,here's a link on how to replace,here's the part.

Posted on May 04, 2013

  • chris hurt May 04, 2013

    ok thank you very much. that helps

  • chris hurt May 04, 2013

    my next question is how to replace that part



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Posted on Jan 02, 2017

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SOURCE: 2004 Chevrolet 2500HD blows hot air out one side

check the fuse check the relay check the compressor and freon level

Posted on Jul 16, 2009

  • 147 Answers


when your car is in defrost it has an ac cycling it removes the moisture then sends the air over the heater core depending on how warm you set it you can feel warm or cold but the ac is always cycling...ridding the need a good ac tech it will be okay...its just expensive going into the heater core if needed...!

Posted on May 07, 2009

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SOURCE: The HVAC does not switch

The blend door is controlled by an electric stepper motor, very likely the motor is defective or the door is stuck.

Posted on Sep 05, 2008

  • 159 Answers

SOURCE: how do i know if the temp blend door is broke?

Change the temperature of the air and see if the temperature changes. If it doesn't change, then you probably have a bad blend door.

Posted on Dec 09, 2009

  • 1702 Answers

SOURCE: 1999 Chev Suburban 1500 with front and rear ac -

the truck has two evaporator cores one for the front unit one for the rear unit also two expansion valves, one for the front one for the rear.

check the large a/c line going to the rear unit if the line is warm with the A/C compresser running replace the rear expansion valve.

if the line is cold then replace the rear units blend actuator motor. if the frount unit is cold then most likely the blend actuator is the problem, remove the cover from the rear unit and you will see the actuator mounted on the side of the air handler box.

the best way to indentifie the unit is to buy one so you know what your looking for.

let me know if there is any thing else you need.

Posted on Jun 26, 2011

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In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

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