Question about 1999 Chevrolet Silverado 1500
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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Posted on Jan 02, 2017
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 moisture...you need a good ac tech it will be okay...its just expensive going into the heater core if needed...!
Posted on May 07, 2009
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
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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May 18, 2014 | 2000 Dodge Grand Caravan
Jan 30, 2013 | Cars & Trucks
Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
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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