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Old 04-16-2024, 09:19 AM   #1
Johnfin
 
Drives: 2018 ss
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2024 ac stopped working

Anyone just have their a/c stop working? Its blowing warm air and the compressor is running. Tried to look for a fuse in the trunk and cant find it.
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Old 04-16-2024, 10:04 AM   #2
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If the compressor is running and the air is warm it sounds like a blend door is not working properly. On a 2024, this is a dealer warranty issue.
There is a lot more a DIY'er could check, but a dealer will have diagnostic tools that allow them to check the individual damper motors.
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Old 04-16-2024, 10:07 AM   #3
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Quote:
Originally Posted by Johnfin View Post
Anyone just have their a/c stop working? Its blowing warm air and the compressor is running. Tried to look for a fuse in the trunk and cant find it.
Are you sure the compressor is engaged? (The center part of the compressor pulley should be turning) If so, you probably still have refrigerant in the system as the computer would have likely shut down the compressor to protect it if you had lost charge.

If the compressor clutch is engaged and turning, may be a blend door issue.

Definitely check the refrigerant charge

Another thing that can go wrong on the Gen6 is the HVAC high pressure sensor. (There is no low pressure sensor) When it fails, the AC may work intermittently or not at all as the computer uses the sensor info to engage the ac clutch.
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Old 04-16-2024, 11:09 AM   #4
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Originally Posted by wavsine View Post
Definitely check the refrigerant charge
All possibilities. get the warranty claim in.
if you have a leak in a major component, it's a big job. Hopefully no rocks hit the condenser, because I don't think they cover that.
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Old 04-16-2024, 11:11 AM   #5
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I did on a almost new 2015 GT Stang. They had a run of cars that had A/C go out on the 15's.
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Old 04-16-2024, 03:44 PM   #6
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I had the wire break that goes to the compressor control solenoid on the back of the compressor. If there is no power to it, or it goes bad, the compressor will not make any pressure. The bad spot in the wire is buried in the harness, behind the compressor in a place I can't get to so I ran a new wire around that spot to get power to the solenoid. The variable displacement compressors work different than what I was used to, so it took me a little bit to get it figured out.
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Old 04-17-2024, 09:05 AM   #7
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The variable displacement compressors work different than what I was used to, so it took me a little bit to get it figured out.
We have variable displacement compressors? news to me!
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Old 04-17-2024, 10:27 AM   #8
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We have variable displacement compressors? news to me!
Yes, the compressor control valve is a pulse width modulated solenoid, controlled by the BCM to allow refrigerant to the back side of the wobble plate which in turn changes the angle of the plate. When it's not working, the plate runs at zero angle therefore the pistons don't reciprocate and no pressure is made. They have been in use for a long time now.
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Old 04-17-2024, 11:15 AM   #9
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Yes, the compressor control valve is a pulse width modulated solenoid...
Nice. I had variable displacement on my 2003 Saab, but I think mode of operation was different. That was a new thing at the time. Was not aware how the tech progressed.
https://www.motor.com/magazine-summa...t-compressors/
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Old 04-17-2024, 12:36 PM   #10
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Falling into the obvious category, are you sure all of your interior vents are open? Just one being closed cuts airflow enough to drive head pressure in the system up enough to reduce compressor output.

My wife likes to be cool but cannot stand to have air blowing on her. My attempts to explain how these two things are mutually exclusive are, even after 46 years, futile.

Assuming the vents are open my money is on a blend door.
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Old 04-17-2024, 01:42 PM   #11
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My wife likes to be cool but cannot stand to have air blowing on her. My attempts to explain how these two things are mutually exclusive are, even after 46 years, futile.
Sheesh! And I'm only a 30-year member of this club.
There is NO hope
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Old 04-17-2024, 06:44 PM   #12
Johnfin
 
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I think it was a stuck blend door. Its working now but
When it went out i remember hearing a clunk inside
The cabin. Well, its working again so thats good.
Now the blower motor in my house ac took a dump.
$2700 for the original motor.
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Old 04-18-2024, 07:09 AM   #13
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Quote:
Originally Posted by Johnfin View Post
Now the blower motor in my house ac took a dump.
$2700 for the original motor.
Blower motors (both new and used) on ebay run a couple hundred bucks.
Just in case you can DIY.
ECM might carry extended warranty.
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Old 04-18-2024, 07:25 AM   #14
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Quote:
Originally Posted by Johnfin View Post
I think it was a stuck blend door. Its working now but
When it went out i remember hearing a clunk inside
The cabin. Well, its working again so thats good.
Now the blower motor in my house ac took a dump.
$2700 for the original motor.
Me 6 months ago. Good news is you didn’t get hosed! I paid the same
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