Hvac issue
Thread Starter
Instructor
Joined: Jan 2020
Posts: 176
Likes: 183
From: Cincinnati
Hvac issue
2015 ZO6. I only get airflow from ac vents. No flow to floor or defrost. While looking for scanner for abs bleeding i saw some scanners will move blend doors and activate actuators. Anyone know if this might resolve issues? Thx
Le Mans Master
Joined: Oct 2014
Posts: 8,687
Likes: 2,731
From: Atlanta GA
I dont think it will resolve your issues but , it will point you in the right direction.... If you command each blend doors to move , and they do .... then the problem is with the control module, if they dont move then the problem is with the actuator
My money is on the actuators ... and they are a real pain in the butt to replace as the dashboard has to be disassembled
Good Luck , let us know what you find
Dave
My money is on the actuators ... and they are a real pain in the butt to replace as the dashboard has to be disassembled
Good Luck , let us know what you find
Dave
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Good luck with the fix - hope it does not turn out to be a major disassembly project.
Corvette Enthusiast
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I had this same thing happen to me. The fix was a new blend door and actuator.
Racer
Joined: Mar 2020
Posts: 375
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From: Texas
/JD
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Racer
Joined: Mar 2020
Posts: 375
Likes: 144
From: Texas
So the module was replaced and programmed. Fingers crossed that this is the fix.
/JD
Last edited by jdaniels138; Jan 24, 2026 at 10:48 AM.
Racer
Joined: Mar 2020
Posts: 375
Likes: 144
From: Texas
/JD
Racer
Joined: Mar 2020
Posts: 375
Likes: 144
From: Texas
They've been fair...
Credited my first service cost for the calibation that didn't work to the second.
And will credit the second service cost for replacing the control module to the work required to replace the actuators.
I also like that they didn't go straight to pulling the dash and replacing the actuators, they tried the least intrusive repairs first.
I've been going there since I bought the car and always see other Vettes there being serviced.
/JD
Credited my first service cost for the calibation that didn't work to the second.
And will credit the second service cost for replacing the control module to the work required to replace the actuators.
I also like that they didn't go straight to pulling the dash and replacing the actuators, they tried the least intrusive repairs first.
I've been going there since I bought the car and always see other Vettes there being serviced.
/JD
Racer
Joined: Mar 2020
Posts: 375
Likes: 144
From: Texas
Got the car back today, Feb 6, 2026.
Will hold on declaring the issue resolved this time. The 4 actuators were replaced.
There is a rattle from the vent near the door on the passenger side. Pretty apparent and easy to reproduce.
Planning give them a call tomorrow to request for that to be checked and resolved. But will drive it for at least a week to make sure all is good before taking it back in.
/JD
Will hold on declaring the issue resolved this time. The 4 actuators were replaced.
There is a rattle from the vent near the door on the passenger side. Pretty apparent and easy to reproduce.
Planning give them a call tomorrow to request for that to be checked and resolved. But will drive it for at least a week to make sure all is good before taking it back in.
/JD
Melting Slicks
Joined: Feb 2018
Posts: 2,215
Likes: 1,071
From: North Texas
They almost always fix one thing while breaking another. That's even if they guess right and actually fix the first thing.
I don't even trust them to wash my car.
That's why I do all my own work.
Note: I went bt a Lexus dealer and on their lot was a new LC500 convertible with a large sign on the windshield "DO NOT WASH" even though the car was very dirty. A very smart buyer knew better.
I don't even trust them to wash my car.
That's why I do all my own work.
Note: I went bt a Lexus dealer and on their lot was a new LC500 convertible with a large sign on the windshield "DO NOT WASH" even though the car was very dirty. A very smart buyer knew better.
Racer
Joined: Mar 2020
Posts: 375
Likes: 144
From: Texas
They almost always fix one thing while breaking another. That's even if they guess right and actually fix the first thing.
I don't even trust them to wash my car.
That's why I do all my own work.
Note: I went bt a Lexus dealer and on their lot was a new LC500 convertible with a large sign on the windshield "DO NOT WASH" even though the car was very dirty. A very smart buyer knew better.
I don't even trust them to wash my car.
That's why I do all my own work.
Note: I went bt a Lexus dealer and on their lot was a new LC500 convertible with a large sign on the windshield "DO NOT WASH" even though the car was very dirty. A very smart buyer knew better.
Found the source of that rattle while cleaning it up today: the plastic dash panel on the passenger side (the one visible when the door is open) was out of alignment. Tapping it reproduced the noise perfectly, so I repositioned it for now. I’ll likely pull it off later to apply some foam insulation tape to quiet it down permanently.
Im a DIY guy as well, but didn't want to tackle the A/C issue given all the posts I'd read about this issue. I've partially disabled the dash before on Honda's but not to the extent required to replace the blend door aquators.
/JD
Racer
Joined: Mar 2020
Posts: 375
Likes: 144
From: Texas
Got the car back today, Feb 6, 2026.
Will hold on declaring the issue resolved this time. The 4 actuators were replaced.
There is a rattle from the vent near the door on the passenger side. Pretty apparent and easy to reproduce.
Planning give them a call tomorrow to request for that to be checked and resolved. But will drive it for at least a week to make sure all is good before taking it back in.
/JD
Will hold on declaring the issue resolved this time. The 4 actuators were replaced.
There is a rattle from the vent near the door on the passenger side. Pretty apparent and easy to reproduce.
Planning give them a call tomorrow to request for that to be checked and resolved. But will drive it for at least a week to make sure all is good before taking it back in.
/JD
/JD
Burning Brakes
Joined: Feb 2018
Posts: 759
Likes: 337
From: Grand Rapids, MN
Thank you for sharing - I will be dealing with this in the spring. Last fall started having issues with changing air flow modes. I could not change but they changed on their own a few times.
