Ac issues

[Todd Harvey]

I have a 2015 silverado 1500. My ac is not working it just blows Luke warm air. It's full of freon and I had the compressor and condenser replaced. Any ideas

[richard wysong]

What are the pressures with the compressor running? First thing that comes to mind is that you have a leak and it's low on freon. Why did you replace the compressor? Did it grenade? You should have changed the accumulator and orifice tube and flushed the evaporator if there was ANY signs of debris in the system. If you don't have a set of refrigerant gauges run down to harbor freight or go online and get a set. Another possibility is the system has been overfilled but without knowing the pressures we would just be guessing

[Todd Harvey]

[Todd Harvey]

That is while it's running

 

[Todd Harvey]

I was told it was to replace the compressor when it first started

[richard wysong]

That is just the gauge on the can, you need to know high side pressures as well. Are any of the pipes going to the evaporator cold? Did you vacuum the system before refilling after replacing the parts? it is possible the blend door actuator is broken not allowing the cold air into the cabin if the lowside pipe is cold. Did you fill the compressor and replace any oil lost with the condenser change. 

[Todd Harvey]

It was all done at a shop so I'm not 100 percent sure

 

[Todd Harvey]

There is a fairly lound humming coming from behind the glove boxes when it's on full blast

[jalexa5834]

@Todd Harvey I have what may be a similar issue. My 2014 had it's compressor literally blow apart. They had to replace/clean out everything! Worked great for about 1.5 years. Now having cooling issues,again. Went back to shop that did the repair and when they checked everything out, good pressure and everything.  Except it still doesn't cool. I was told I need to have the 'blend' door(s) checked because it may be blending air instead of directly blowing air through the correct vents. Cycling the defrost, heat, and air didn't help. I was told I need to go to the dealership and have them use their scan tool to see if the blend doors are working properly. Apparently there is a little motor that actuator the doors.

 

If anyone knows how I can check this without going to the dealer it would be appreciated!

Edited June 9, 2024 by jalexa5834

[Todd Harvey]

11 minutes ago, jalexa5834 said:

@Todd Harvey I have what be a similar issue. My 2014 had it's compressor literally blow apart. They had to replace/clean out everything! Worked great for about 1.5 years. Now having cooling issues,again. Went back to shop that did the repair and when they checked everything out, good pressure and everything.  Except it still doesn't cool. I was told I need to have the 'blend' door(s) checked because it may be blending air instead of directly blowing air through the correct vents. Cycling the defrost, heat, and air didn't help. I was told I need to go to the dealership and have them use their scan tool to see if the blend doors are working properly. Apparently there is a little motor that actuator the doors.

 

If anyone knows how I can check this without going to the dealer it would be appreciated!

See I was told everything under the hood had been replaced and it was all good. They told me if that didn't fix it then It was something behind the dash but didn't say what it was. They also told me it would be another $500 after I've already put $1000 into it

[jalexa5834]

@Todd Harvey Dang! It cost me close to $3,000 when mine blew up! My compressor had a big hole in the bottom when it failed! Freon was everywhere under the hood. Now, if I have to go to a dealership and have it checked. Then, if I elect to have them repair it, several hundred more! I live in NorCal and this past week it was over 106°!! And, my truck is black! I'm hardly driving it now; just too hot. Luckily my wife has a Yukon that blows cool air.

 

Anyone know how I can check those doors without have to go to the dealership?

[richard wysong]

A scan tool that does body codes should be all that is needed to check it That is crazy $, the actuator is less than $100 and about an hour to change. Sounds like your garage is sending you down the road because they do not know how to fix it after taking your $. I'm not sure if the parts store scanners do body codes but it's worth asking.

[Snowcamo]

The txv should be changed with the compressor.  A defective txv is likely the root cause of the no cool it. They adjust the superheat of the evaporator. It's a refrigerant metering device. 

 

The drier in the bottom of the condenser should be changed as well.

Edited June 9, 2024 by Snowcamo

[MaverickZ71]

Cabin air filter behind the glove box can get clogged up and block air flow, with the blower running on high and not much cooling occurring.  Probably not that easy, but worth a look. 

 

Those blend door actuators suck. Apparently they're all made in China and have a short life expectancy. There's like 8 of them, they cost $25-50 each pre-Bidenomics and they have to tear half the dash apart to do some of them. 2 of ours are out at any given time since off warranty, only $400+ to fix each time, "non user serviceable" because you have to use a $3000 scan tool with special GM programming to recognize the new servos and realign the system doors.

Edited June 9, 2024 by MaverickZ71

[jalexa5834]

@Snowcamo I was told that everything had to be replaced at the time because some of the compressor went all through the system. Never hurts to pull up that invoice and see what's listed, huh?!!