2014 Denali AC problems - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

 
LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 09-10-2019, 08:01 PM Thread Starter
 
Join Date: Sep 2019
Posts: 2
2014 Denali AC problems

Ive got a 2014 Denali LML and last week the AC quit and I started digging but cant find what the problem is.
I stated by checking the compressor, it was no engaging. Freon is full, fuses are good, swapped in a new HVAC control unit, new pressure sensor with no luck. I had another LML over and we ran thru some fuses and wires are the compressor. I found out that I have a ground at compressor plug, but no signal from the 12v to engage the compressor. I then went to the fuse, the ground it ran thru the fuse and it has no ground at the fuse. I grounded out the fuse and nothing, but I can pull the plug from the compressor and run a 12v and ground from the battery and it will engage and compressor and work fine. I don't know if I am looking for the fuse not being ground of if I should trace the 12v from the compressor wire to find the problem there.

I think it would be really helpful to have a wiring diagram of the truck or just the AC system.
What do you recommend testing or trying?
Curtis Glasby is offline  
Sponsored Links
Advertisement
 
post #2 of 2 (permalink) Old 09-10-2019, 08:14 PM Thread Starter
 
Join Date: Sep 2019
Posts: 2
Sorry I didn't read thru the before posting, Some of it is a bit confusing. I cant for the life of me find the edit tab.
At the compressor plug I have a ground but the other prong is the 12v signal wire. It dose not send 12v when the AC snowflake is turned on like it should. Now at the AC compressor fuse the ground runs thru the fuse, but the fuse is not connected to a ground for some reason. Even jumping a wire from the battery - to the fuse will not kick the AC on.
Curtis Glasby is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome