C7 air conditioning issues
Thread Starter
Pro
Joined: Oct 2013
Posts: 553
Likes: 81
From: Mertztown PA
C7 air conditioning issues
2014 C7 Z51
End of last season AC would operate intermittently. Had it checked in October when it went in for inspection. Tech heard of the issue before but had no answers. Everything checked out ok, still no AC. From the beginning of this season no AC at all.
The service department hasn't been able to shed any lite on the issue. Any body else have this kind of issue?? Seams like the computer isn't pulling in the compressor?
End of last season AC would operate intermittently. Had it checked in October when it went in for inspection. Tech heard of the issue before but had no answers. Everything checked out ok, still no AC. From the beginning of this season no AC at all.
The service department hasn't been able to shed any lite on the issue. Any body else have this kind of issue?? Seams like the computer isn't pulling in the compressor?
Burning Brakes
Joined: Oct 2013
Posts: 1,122
Likes: 381
From: Southeastern PA
Irrespective of whether anyone else has had the problem, it’s time for a “second opinion” from another dealer’s service department.
Last edited by runner61627; May 28, 2019 at 08:32 PM.
Safety Car
Joined: Dec 2012
Posts: 3,844
Likes: 1,858
From: St. Louis Metro East IL
Does the A/C compressor clutch engage?
There is both a fuse and relay in the under hood fuse box that control the A/C clutch. Of course, low refrigerant pressure will short cycle the compressor or prevent clutch from engaging.
I had a stuck relay on another older car. I just swapped it for an identical relay - clutch engaged, then swapped relays back and all continued to work.
GL
Ron
There is both a fuse and relay in the under hood fuse box that control the A/C clutch. Of course, low refrigerant pressure will short cycle the compressor or prevent clutch from engaging.
I had a stuck relay on another older car. I just swapped it for an identical relay - clutch engaged, then swapped relays back and all continued to work.
GL
Ron
Burning Brakes
Joined: Apr 2016
Posts: 1,086
Likes: 285
From: Round Rock, TX
Exactly, go to another dealer. If they can’t figured it out, or have any suggestions on what’s going on I wouldn’t be taking my car there.
Instructor
Joined: Feb 2016
Posts: 186
Likes: 64
From: Gainesville Georgia
I found this post by...RobBeacon; .
I didn't copy all of his post.
Blower motor is located under the passenger side dash there are 3 plastic screw fasteners holding the cover on.
Hope this helps
. If your fuses aren't blown I would recommend unplugging an plugging the motor back in. For whatever reason this worked for me. I actually pulled the entire assemble out removed the cover on the blower motor and tested the capacitors on the board they all had some voltage in them and nothing looked burnt. I then checked for voltage at the wire and sure enough it was there. plugged it back in and it started working. No idea why this would work but it did so before wrestling with those 5.5mm bolts I would try removing plug and plugging back in.
Blower motor is located under the passenger side dash there are 3 plastic screw fasteners holding the cover on.
Hope this helps
Team Owner
Joined: Apr 2013
Posts: 26,228
Likes: 4,356
From: Chirper Island
Safety Car
Joined: Dec 2012
Posts: 3,844
Likes: 1,858
From: St. Louis Metro East IL
The OP says no A/C or intermittent A/C but does not say no heat or air flow. He questions compressor operation - so likely not a blower issue, but a lack of cold air. Most likely a compressor, fuse, relay, diverter door or controls issue. There was one recent case where the owner just had to cycle through various modes and the diverter door apparently started working.
Ron
Ron
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Instructor
Joined: Feb 2016
Posts: 186
Likes: 64
From: Gainesville Georgia
Removing the electrical plug at the fan blower motor and reconnecting the electrical connector my fan started working and I have not had an issue with it since. The fan blower motor has a built in resistor at the connector that may have been shorted and is replaceable, it's tight quarters but doable and a diy project.
Race Director
Joined: Dec 2002
Posts: 10,461
Likes: 1,149
From: Wayne Township WI
Didn't say whether there's an extended warranty. 
This really isn't for a dealer anyway, especially if out-of-warranty.
A shop specializing in AC is, hopefully local area has one.
If so take it there, they'd have it diagnosed quickly & repair whatever for <$ than any dealer.
Which assumes dealer's are capable of even ID'g issue.
This really isn't for a dealer anyway, especially if out-of-warranty.
A shop specializing in AC is, hopefully local area has one.
If so take it there, they'd have it diagnosed quickly & repair whatever for <$ than any dealer.
Which assumes dealer's are capable of even ID'g issue.
Drifting
Joined: Oct 2011
Posts: 1,872
Likes: 333
From: Olmsted Falls Ohio
St. Jude Donor '12 thru '24
Low probability, but check the electrical connector on the compressor itself. My 2015 had intermittent a/c shortly after delivery that eventually quit altogether. Dealer found that connector not fully seated, probably an assembly line error.
Burning Brakes
Joined: May 2017
Posts: 802
Likes: 248
From: Vero Beach Florida
My car is in the dealership right now to have the A/C compressor replaced and I thought it was just a faulty pressure relief valve as I had good cooling. Only 2K miles. See my other recent post.
Anything to do with A/C, I recommend the dealership. If it requires a major component replacement, e.g. the compressor, they have to drop the front engine cradle which is 8 hours of labor. I wouldn't want an independent A/C shop doing that as someone else suggested. Plus components are not typically stocked and have to be shipped which takes three days as GM did not pay the extra Fedex shipping cost to over-night my compressor.
Anything to do with A/C, I recommend the dealership. If it requires a major component replacement, e.g. the compressor, they have to drop the front engine cradle which is 8 hours of labor. I wouldn't want an independent A/C shop doing that as someone else suggested. Plus components are not typically stocked and have to be shipped which takes three days as GM did not pay the extra Fedex shipping cost to over-night my compressor.
1st Gear
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1st Gear
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7th Gear
Joined: May 2023
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From: NJ
C7 hvac not working
The OP says no A/C or intermittent A/C but does not say no heat or air flow. He questions compressor operation - so likely not a blower issue, but a lack of cold air. Most likely a compressor, fuse, relay, diverter door or controls issue. There was one recent case where the owner just had to cycle through various modes and the diverter door apparently started working.
Ron
Ron
I have been scouring YouTube and this forum trying to find an answer to a similar issue. over the summer, I left the top off my car and it had some rain get inside. As soon as I realized it was raining, of course wiped it all up, but then I started having issues. The entire infotainment center was not lighting up and I was unable to use any music Bluetooth cigarette later heating, etc. I’ve searched the Internet. I’ve disconnected reconnected the battery, checked the fuses and pulled most of them and put them back in in the trunk and in the hood I got Music Bluetooth and the cigarette plug thing to start working again after popping off some of the dash trim near the driver side foot well or under the seat wiring harness is somehow how I got music Bluetooth, charging adapter etc.working again.
I still have no heat or AC. The display buttons are not illuminated. And when I attempt to push the various HVAC control buttons (not dials), it will change the song that I have playing. Any suggestions or ideas? I hope I gave enough information. Thank you for your help!!
Intermediate
Joined: May 2020
Posts: 34
Likes: 42
From: Snyder, Texas
Plug for the blower motor. I got to it and was trying to figure out how to unplug it. Before I got it out, I started the car to see if wiggling it had done any good. Blowing strong. I pushed on the plug to make sure it was in there good and put the cover back on.