A/C operation question
Thread Starter
Drifting
Joined: Sep 2011
Posts: 1,424
Likes: 232
From: Licking MO
A/C operation question
Our 15 Z is blowing uncomfortably hot air on my feet with A/C on. Bilevel helps some but not much. Putting all air to the floor does get cold air. Also have a bit of a whistle in the system when on bilevel and fan speed is up past half way.
Chevy tech says its normal. Didn't have this much heat on my feet when we first got the car. Did a six and half hour trip to Indianapolis the summer before and wasn't uncomfortable.
Anyone else have this problem and a solution?
Chevy tech says its normal. Didn't have this much heat on my feet when we first got the car. Did a six and half hour trip to Indianapolis the summer before and wasn't uncomfortable.
Anyone else have this problem and a solution?
Le Mans Master
Joined: May 2000
Posts: 8,729
Likes: 1,508
From: Redmond WA
No, I do not get warm air at my feet. The vent down there isn't very large, so I could complain that I don't get enough cold air, but there's no warm air.
If you're seeing warm air -discharged from the system- down there I don't think that's normal.
I'd get a thermal gun (cheap now, or borrow a friend's). Put the system in normal maximum Cold operation with upper, mid, and lower discharge turned on. All three should be about the same temp, give or take. If one, like the foot, is wildly different then I would guess one of the actuators internally is not working properly.
Maybe on "Foot" it works but when you've got other vents discharging you wind up with ambient or heated air out the bottom, and this is one way to check.
Dave
If you're seeing warm air -discharged from the system- down there I don't think that's normal.
I'd get a thermal gun (cheap now, or borrow a friend's). Put the system in normal maximum Cold operation with upper, mid, and lower discharge turned on. All three should be about the same temp, give or take. If one, like the foot, is wildly different then I would guess one of the actuators internally is not working properly.
Maybe on "Foot" it works but when you've got other vents discharging you wind up with ambient or heated air out the bottom, and this is one way to check.
Dave
Last edited by davepl; Nov 4, 2016 at 12:39 PM.
Thread Starter
Drifting
Joined: Sep 2011
Posts: 1,424
Likes: 232
From: Licking MO
Already had the dealer do that. Footwell air was 100 degrees according to mechanic. They called Chevy tech and were told it was designed as race car and its normal.
Last edited by Steve Garrett; Nov 18, 2016 at 11:22 PM. Reason: No need to re-quote the previous post, especially if you're the next person posting.
Le Mans Master
Joined: May 2000
Posts: 8,729
Likes: 1,508
From: Redmond WA
I doubt that's a direct quote, but if it's discharging 100F air through the AC vents then I would say that's likely outside the spec of normal operation.
They've obviously just jerking you around on this, you need to push back or find a different dealer if you want it fixed. I think a different dealer would be a better option.
They've obviously just jerking you around on this, you need to push back or find a different dealer if you want it fixed. I think a different dealer would be a better option.
Last edited by Steve Garrett; Nov 18, 2016 at 11:23 PM. Reason: No need to re-quote the previous post, especially if you're the next person posting.
Melting Slicks
Joined: Feb 2009
Posts: 2,797
Likes: 608
From: Dallas Georgia
2020 Corvette of the Year Finalist (track prepared)
C3 of Year Winner (track prepared) 2019
I have noticed the footwell heating up on my car when the dash vents are blowing. Not something I have been concerned with up to this point but has been noticeable to me. Having driven track cars, Vipers and other cars with really warm pedal boxes, I was not all that surprised. I have switched to floor mode and it quickly goes away. I attributed it to firewall heat.
Thread Starter
Drifting
Joined: Sep 2011
Posts: 1,424
Likes: 232
From: Licking MO
To the above:
I've had good luck with my dealer, had the differential replaced under warranty. Don't think they are jerking me around but will persue further.
No I have not had the reflash done.
Would not be too concerned if it was warm but it is uncomfortably hot and you cannot keep the car comfortably cool.
Thanks for the replies.
I've had good luck with my dealer, had the differential replaced under warranty. Don't think they are jerking me around but will persue further.
No I have not had the reflash done.
Would not be too concerned if it was warm but it is uncomfortably hot and you cannot keep the car comfortably cool.
Thanks for the replies.
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Pro
Joined: Nov 2015
Posts: 625
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From: TX
St. Jude Donor '16
To add to a/c oddity, mine seems to not stay on recirc despite the light being on. It seems if I push the recirc twice, turn off and on, it feels to be back on recirc. Usually feels off on each new start of the car, as if the light indicator is wrong and the vents are open by default.
Normal?
Normal?
Last edited by Never Settle; Nov 11, 2016 at 11:06 PM.
Drifting
Joined: Jan 2016
Posts: 1,465
Likes: 449
I can't believe the OP accepted that crap about it being a "race car"....and, I guess I can't believe a real Chevrolet dealer would even say that! To add, I can't believe any Corvette owner (especially someone who dropped around $100K on a new one) could contain his anger if this was said to them. I would have exploded...sorry, BS like that is as much an insult to the receiver as it is a stupid response.
Thread Starter
Drifting
Joined: Sep 2011
Posts: 1,424
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From: Licking MO
Tzoid9, I didn't accept it as a final answer. They are still working on a solution. Chevy now says they are aware of the problem but don't have a solution. They are going to let the dealer add some insulation. Appointment Tuesday, will let you know what happens.
Thread Starter
Drifting
Joined: Sep 2011
Posts: 1,424
Likes: 232
From: Licking MO
Well no real improvement after Tuesday's visit. They added insulation to the console and reset the actuators but no real improvement.
Haven't talked to them again but we'll see where we go next.
Haven't talked to them again but we'll see where we go next.
Melting Slicks
Joined: Oct 2007
Posts: 2,398
Likes: 858
^^^^Are you in heat or AC mode?
Like others have said if you are in AC mode and getting any hot air from the system you may have a system problem.
If you are in AC mode with most of the air routed through the dash vents and your foot well is getting warm that is likely from the firewall and exhaust heat transferring to the cabin. This can be mitigated by routing some cold air to the floor vents by using "bi-level" and using the seat fans to circulate that air around. Normally this problem occurs during the heat of summer.
If you are in the heating mode and the foot well is to hot, route all the air to the upper vents. This is because the foot well is generally warm enough once the car is running for a while due to the heat transfer from the firewall and exhaust.
If you are actually getting continuous 100* air from the floor vents regardless of the above that might be an issue. Just keep in mind even when the system is completely off the fan may be on at a very low speed and blowing air at whatever temperature the evaporator core is, which is normally pretty warm in these cars unless the AC is on and set low enough to route coolant to the core.
As I understand it the HVAC re-flash cures much this issue and reduces the need for much of the above.
Like others have said if you are in AC mode and getting any hot air from the system you may have a system problem.
If you are in AC mode with most of the air routed through the dash vents and your foot well is getting warm that is likely from the firewall and exhaust heat transferring to the cabin. This can be mitigated by routing some cold air to the floor vents by using "bi-level" and using the seat fans to circulate that air around. Normally this problem occurs during the heat of summer.
If you are in the heating mode and the foot well is to hot, route all the air to the upper vents. This is because the foot well is generally warm enough once the car is running for a while due to the heat transfer from the firewall and exhaust.
If you are actually getting continuous 100* air from the floor vents regardless of the above that might be an issue. Just keep in mind even when the system is completely off the fan may be on at a very low speed and blowing air at whatever temperature the evaporator core is, which is normally pretty warm in these cars unless the AC is on and set low enough to route coolant to the core.
As I understand it the HVAC re-flash cures much this issue and reduces the need for much of the above.
Last edited by Steve Garrett; Nov 18, 2016 at 11:24 PM. Reason: No need to re-quote the previous post, especially if you're the next person posting.
Thread Starter
Drifting
Joined: Sep 2011
Posts: 1,424
Likes: 232
From: Licking MO
Thanks for the reply. Definitely a problem in A/C mode and also seems too warm on my feet at around 45 degrees as it was Tuesday morning. Chevy seems to be dragging their feet on letting them do the reflash. I'll persue further.
4th Gear
Joined: Apr 2021
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