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A/C failure cause???

Somethingclever_2014GM
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Somethingclever_2014GM New Member

Somethingclever_2014GM

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Profile: 2014 Chevy Silverado. 5.3L Z71 crew cab short box. 

Can't isolate the problem with my truck A/C. 

 

Blows air temperature air out of it. A/C compressor clutch turns when turned on. Turns off when turned off. A/C module used to get stuck if you accidently turned it to warm air and back to cool. Knob would turn all the way, but the temp would not get as cool as it did. Now it does not get cool at all. 

A/C freon levels have recharged, purged, and recharged again. Ensured proper levels of refrigerant went into A/C system. No difference. 

I have checked all the fuses and relays. No problem there. 

Can't figure out if it is a blend door actuator, A/C inlet valve actuator, A/C control module, A/C sensor, or A/C compressor. Limited tools and income, so the level of testing is pretty basic. Welcome ideas and solutions. Thank you.

asilverblazer Senior Enthusiast

asilverblazer

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Posted
20 hours ago, Somethingclever_2014GM said:

...A/C module used to get stuck if you accidently turned it to warm air and back to cool. Knob would turn all the way, but the temp would not get as cool as it did. Now it does not get cool at all...

Can't figure out if it is a blend door actuator...

Not sure what part you are referring to as "getting stuck" but if the blend door was getting stuck and finally gave up, that's where I would start. 

 

If it is a dual zone system, does either side get cold?

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Rad_Rado17 Enthusiast

Rad_Rado17

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Posted
On 5/31/2026 at 2:35 PM, Somethingclever_2014GM said:

Profile: 2014 Chevy Silverado. 5.3L Z71 crew cab short box. 

Can't isolate the problem with my truck A/C. 

 

Blows air temperature air out of it. A/C compressor clutch turns when turned on. Turns off when turned off. A/C module used to get stuck if you accidently turned it to warm air and back to cool. Knob would turn all the way, but the temp would not get as cool as it did. Now it does not get cool at all. 

A/C freon levels have recharged, purged, and recharged again. Ensured proper levels of refrigerant went into A/C system. No difference. 

I have checked all the fuses and relays. No problem there. 

Can't figure out if it is a blend door actuator, A/C inlet valve actuator, A/C control module, A/C sensor, or A/C compressor. Limited tools and income, so the level of testing is pretty basic. Welcome ideas and solutions. Thank you.

Check the a/c condenser.............they are notorious for cracking at the pinch weld.  Look through the grill on the driverside.  There's a small tack weld.  If I remember right if you hold up a black light the refrigerant will glow if the weld is cracked  

 

AC Condenser replacement : r/Silverado

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newdude Senior Enthusiast

newdude

Posted
Posted (edited)

Hopefully your system has leak dye in it still?  A black light will help find the dye at the leaks.  

 

Yea condenser leak is probably the most common issue on the 2014-2018 generation 1500s.  

 

Next common would be the one hose off the compressor or the compressor itself.  2014s used to crack that hose near where it attached to the compressor if I'm not mistaken.    

 

EDIT:  Here's the PI for that line cracking - temp.xml  It can spray dye all over the hose and compressor if it happens.  

Edited by newdude
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Somethingclever_2014GM New Member

Somethingclever_2014GM

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Posted (edited)

No leaks. Replaced the condenser 3 years ago. Problem was found to be caused by the A/C blend door actuator. Just replaced it and it's blowing out the cold air it used to when I bought it. 

17812972329361589756390416668241.jpg

Edited by Somethingclever_2014GM
Included photo of replaced part.
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Rad_Rado17 Enthusiast

Rad_Rado17

Posted
Posted
11 hours ago, Somethingclever_2014GM said:

No leaks. Replaced the condenser 3 years ago. Problem was found to be caused by the A/C blend door actuator. Just replaced it and it's blowing out the cold air it used to when I bought it. 

I just delt with this this morning.  Already replaced my condenser two years ago.  I didn't have to replace my blend door actuator, I just had to do the relearn process and it worked. 

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Somethingclever_2014GM New Member

Somethingclever_2014GM

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Glad it worked for you. I tried that 1st, about 2 years ago. Didn't help. I also tried doing a hard reset (disconnecting battery for minimum of 30 minutes). Worked a couple times, but after one summer of doing it over and over, that no longer worked. 

I was fairly confident it was either the compressor or a failed actuator, but I just couldn't identify which one. Had to research which actuators do what and which last numbers are associated with each.

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Rad_Rado17 Enthusiast

Rad_Rado17

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Posted
On 6/12/2026 at 1:53 PM, Somethingclever_2014GM said:

Glad it worked for you. I tried that 1st, about 2 years ago. Didn't help. I also tried doing a hard reset (disconnecting battery for minimum of 30 minutes). Worked a couple times, but after one summer of doing it over and over, that no longer worked. 

I was fairly confident it was either the compressor or a failed actuator, but I just couldn't identify which one. Had to research which actuators do what and which last numbers are associated with each.

Spoke to soon.  The next day my A/C wasn't getting very cold again.  I checked the system, compressor was good, both fans spinning strong.  I recharged the system myself using the UV refrigerant, the next day I used a black light and the Schrader valve has failed.  Seems like an easy fix, just glad it's not the compressor or the evaporator coil under the dash.

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