A/C blowing warm in Silverado

[idrivea4banger]

So my 2014 silverado ac is blowing warm. Right now when I press the ac button I'm hearing a whistling type of noise coming from the middle top of the dashboard. Haven't had this truck 3 years and this happens. Anyone got any ideas? Low coolant? Accumulator switch? Blend door motor?

[2011GT]

Is the compressor running when the ac is on or does it cycle on and off quickly? Does it blow hot air when sitting still and at highway speeds?

[idrivea4banger]

Is the compressor running when the ac is on or does it cycle on and off quickly? Does it blow hot air when sitting still and at highway speeds?

When I press the AC button I can hear it turn on and then what sounds like air whistling like. Warm air blows at idle or while driving.

[silverranger]

When I press the AC button I can hear it turn on and then what sounds like air whistling like. Warm air blows at idle or while driving.

are both fans running?

[2011GT]

If the compressor stays running and doesnt quick cycle and you're getting hot air regardless of the trucks speed my next guess would be a bad blend door. Or a clogged cabin filter.

[idrivea4banger]

are both fans running?

Just checked, neither one are turning. Im assuming the fans you speak of are the ones behind the radiator?

[71chevellejohn]

My '15 Sierra was blowing warm shortly after I bought it. When I took it in there was a service bulletin for one of the lines needing an extra bracket. With the bracket the line cracks and you lose all the refrigerant. Since they fixed that, it's been solid for 140k or so miles.

[idrivea4banger]

My '15 Sierra was blowing warm shortly after I bought it. When I took it in there was a service bulletin for one of the lines needing an extra bracket. With the bracket the line cracks and you lose all the refrigerant. Since they fixed that, it's been solid for 140k or so miles.

Wouldn't there be a stain where all the fluid leaked or an odor?

[silverranger]

Just checked, neither one are turning. Im assuming the fans you speak of are the ones behind the radiator?

yes sir, there are a ton of bulletins out on them. Mine did that but both fans were running, the high pressure switch came loose somehow.

[idrivea4banger]

Man, I haven't received anything or heard anything about this.


Plus, I believe my truck no longer is under warranty.

[silverranger]

Man, I haven't received anything or heard anything about this.


Plus, I believe my truck no longer is under warranty.

Mine was out of warranty too, I drove down to LazerSVT shop and he had it fixed ASAP

Might PM him or call his shop and ask him

[idrivea4banger]

If the compressor stays running and doesnt quick cycle and you're getting hot air regardless of the trucks speed my next guess would be a bad blend door. Or a clogged cabin filter.

Haven't changed cabin filter and blend door seems like and easy fix but I don't want to replace it without knowing it went bad or if something else is causing an issue.



One thing I did notice is that when it stopped blowing cold air it did it within a 35 minute time period. When I left work on Friday to pick up my son, when I got to his house it blew warm by then.

[idrivea4banger]

Mine was out of warranty too, I drove down to LazerSVT shop and he had it fixed ASAP

Might PM him or call his shop and ask him

Just sent him a PM about this thread.

If you don't mind me asking, was it costly?

[bcoop]

You whine and cry every time this truck has an issue.


It's a vehicle. They break!

[idrivea4banger]

You whine and cry every time this truck has an issue.


It's a vehicle. They break!

lemme have my cheese with my whine!!!



I need a few beers.......

No squeaky seat though!!!