C7 A/C not cold enough?
#21
The AC will work MUCH better in hot weather when set to recirculation mode. Recirc doesn't completely cut outside air but it greatly reduces the amount and thus the load on the cooling system.
When coming into a superheated car (inside temp far higher than outside ambient) the AC system will cool much more quickly if you put the windows down for a short time to quickly shed the extra heat.
In stop and go/low speed driving staying in lower gears longer will keep the engine RPM up where the compressor is in a more effective operating range. With the auto for long lights shifting to neutral will help slightly and reduce transmission heating.
Even without the transparent roof (which I have) the Corvette has a lot of glass with a big windshield and rear hatch so think of it as a stylish and cool version of the much mocked AMC Pacer
When coming into a superheated car (inside temp far higher than outside ambient) the AC system will cool much more quickly if you put the windows down for a short time to quickly shed the extra heat.
In stop and go/low speed driving staying in lower gears longer will keep the engine RPM up where the compressor is in a more effective operating range. With the auto for long lights shifting to neutral will help slightly and reduce transmission heating.
Even without the transparent roof (which I have) the Corvette has a lot of glass with a big windshield and rear hatch so think of it as a stylish and cool version of the much mocked AMC Pacer
Last edited by NSC5; 07-07-2016 at 05:46 PM.
#22
Team Owner
The AC will work MUCH better in hot weather when set to recirculation mode. Recirc doesn't completely cut outside air but it greatly reduces the amount and thus the load on the cooling system.
When coming into a superheated car (inside temp far higher than outside ambient) the AC system will cool much more quickly if you put the windows down for a short time to quickly shed the extra heat.
In stop and go/low speed driving staying in lower gears longer will keep the engine RPM up where the compressor is in a more effective operating range. With the auto for long lights shifting to neutral will help slightly and reduce transmission heating.
Even without the transparent roof (which I have) the Corvette has a lot of glass with a big windshield and rear hatch so think of it as a stylish and cool version of the much mocked AMC Pacer
When coming into a superheated car (inside temp far higher than outside ambient) the AC system will cool much more quickly if you put the windows down for a short time to quickly shed the extra heat.
In stop and go/low speed driving staying in lower gears longer will keep the engine RPM up where the compressor is in a more effective operating range. With the auto for long lights shifting to neutral will help slightly and reduce transmission heating.
Even without the transparent roof (which I have) the Corvette has a lot of glass with a big windshield and rear hatch so think of it as a stylish and cool version of the much mocked AMC Pacer
#24
Four thoughts:
1) The heat that comes in from the transparent top is significant. If it is sunny out the heat added to the passenger compartment while sitting or driving can be very high. If you have the transparent top, on those days that you know it is going to be hot and sunny install one of the suction cup mounted headliners onto the inside of the transparent top to reduce the heat gain. RPI Designs sells two different liners. I bought the more expensive of the two and am VERY happy with the look and the fit.
2) The maximum start up fan speed can be adjusted in the settings. If I remember correctly there is a High, Medium, and Low setting. It is designed to help keep the fan speed at a reasonable noise level. Obviously if the fan is running slower than it needs to be you won't receive the maximum cooling when you first start up the car and need it most. If it isn't already at High try it there for a few days and see if that improves your temperature control.
3) If you have ventillated seats they can help some too. For maximum effect try manually adjusting the AC to bi-level to get cold air blowing along the floor to the fan under the seat.
4) Make sure you have SYNCh'd the temperature that you desire with the passenger's setpoint if no one is in the vehicle with you. This should help to keep the controls and the system at their most efficient setting.
1) The heat that comes in from the transparent top is significant. If it is sunny out the heat added to the passenger compartment while sitting or driving can be very high. If you have the transparent top, on those days that you know it is going to be hot and sunny install one of the suction cup mounted headliners onto the inside of the transparent top to reduce the heat gain. RPI Designs sells two different liners. I bought the more expensive of the two and am VERY happy with the look and the fit.
2) The maximum start up fan speed can be adjusted in the settings. If I remember correctly there is a High, Medium, and Low setting. It is designed to help keep the fan speed at a reasonable noise level. Obviously if the fan is running slower than it needs to be you won't receive the maximum cooling when you first start up the car and need it most. If it isn't already at High try it there for a few days and see if that improves your temperature control.
3) If you have ventillated seats they can help some too. For maximum effect try manually adjusting the AC to bi-level to get cold air blowing along the floor to the fan under the seat.
4) Make sure you have SYNCh'd the temperature that you desire with the passenger's setpoint if no one is in the vehicle with you. This should help to keep the controls and the system at their most efficient setting.
#25
It will use recirculation in auto mode WHEN it thinks it needs to however it attempts to cool with minimal recirculation and you will get much faster response in most situations selecting recirculation manually. Recirculation in auto mode is a response to inability to cool sufficiently and under most conditions it won't engage this feature until it has already let the passenger compartment get warmer than desired.
The only negative I found to often using manual recirculation was when the car was new (mine is now just over 3 months old with 3,000 miles on it) the new material fumes inside were overwhelming but that has thankfully gone away now.
The only negative I found to often using manual recirculation was when the car was new (mine is now just over 3 months old with 3,000 miles on it) the new material fumes inside were overwhelming but that has thankfully gone away now.
#26
Le Mans Master
I find that if I take it off "auto" mode, and turn the fan all the way up at the 70 degree setting, it blows me out of the car even at temps far beyond 100 degrees....
#27
Melting Slicks
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St. Jude Donor '11
I still think there is a noticeable difference between the C7 and the C5/C6.
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JST4PLA (07-30-2016)
#28
Melting Slicks
With all the windows tinted and a windshield UV/IR rejection coating, my car was vastly improved. Before all that I was constantly fiddling with fan speeds. Now I just leave it on auto and temp at 70F. I'm in south Florida with 96F average highs and the car sitting in the sun as I leave work.
#29
Burning Brakes
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The C7 is the only car I've owned that I haven't seen use recirculating mode when it's set to "auto". It's very odd to me that I have to switch to manual mode to get the recirc function to work.
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Mick14 (08-22-2016)
#31
Melting Slicks
The ac in my 2016 vert is excellent. 95 degrees yesterday and I was actually cold. I set the temp to "lo" and auto and within a minute it's feeling good. I could see how the transparent top of a coupe would bake the occupants but otherwise not sure why anyone wouldn't feel cold .
#32
It is possible the recirc annunciator light may not come on when recirc is commanded under automatic climate control so you may not know when recirc is being used under auto. I expect that auto, instead of going to max recirc, probably dynamically varies the blend between cabin/outside air so it isn't an "on/off" behavior but instead a continuum under full auto. I think the indicator is just for noting manual operation.
#33
Le Mans Master
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St. Jude Donor '09
My C7 a/c indeed does not seem to cool as well as my C6 or C5 did. I use "auto" and leave it on 72, as it was designed to be used. This method worked great in the prior two cars, a marvel of HVAC engineering that I often bragged about.
The C7 a/c has worked noticeably better since I went into the Vehicle Settings and bumped the Auto Fan Speed up to high. At this setting, it works well enough that I can leave it on auto at 72.
The C7 a/c has worked noticeably better since I went into the Vehicle Settings and bumped the Auto Fan Speed up to high. At this setting, it works well enough that I can leave it on auto at 72.
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beaversstonehaven (09-06-2016)
#34
Le Mans Master
Feels to me the C7 windshield generates more heat than our previous two C6's and two C5's. All driven in the same AZ sunshine. Not just me. My wife made the same observation.
I kept my C5's and 6's around 72. I have to set the C7 to 68 for the same comfort.
Maybe our imaginations, but just a thought.
I kept my C5's and 6's around 72. I have to set the C7 to 68 for the same comfort.
Maybe our imaginations, but just a thought.
http://www.llumar.com/choose-a-produ...r-window-films
With that on the windshield, plus Llumar Ceramatix 30% on the sides and back, my A/C has no problem cooling the cabin after it's been sitting outside in the sun, or keeping the cabin cool on a drive.
Last edited by Kracka; 07-08-2016 at 09:10 AM.
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Hoonose (07-08-2016)
#35
Even with the best tint on the market and a sunshade, after sitting in 100 degree heat in the sun for half a day, getting into the car it's still about 140 inside (as opposed to 160, big woop).
After the first 5 minutes of driving make sure the A/C is also on recirculation. The vette's should automatically do that I believe but I could be wrong. I'm more familiar with the C5..
#36
Melting Slicks
No issue here, auto to 72 and it's fine. I do have tinted windows but never had an issue before the tint.
#37
Same for me as well. Our Lexus will freeze you to death set at 68 degrees, the Corvette on the lowest setting doesn't get nearly as cold.
I've notice it is even worse when the car has sat outside. Here's a scenario:
It is 100 degrees outside. I leave the house (car parked in the garage) and the AC blows very comfortably until I reach my destination. Let's say I'm driving 10 miles to Best Buy to gawk at the new TVs. After drooling over 80" televisions in 4k HDR for 30 minutes, I return to my car to head home. It is still 100 degrees outside. However, the AC, with the same settings, doesn't get nearly as cold as before. It can take 10+ minutes to get as cold as before, sometimes more if I'm driving slowly in the city with 30 mph speed limits and plenty of stop lights.
Comparatively, the same exact scenario in the Lexus, getting back in the car after leaving Best Buy and the AC will be ice cold in under 2 minutes.
I've notice it is even worse when the car has sat outside. Here's a scenario:
It is 100 degrees outside. I leave the house (car parked in the garage) and the AC blows very comfortably until I reach my destination. Let's say I'm driving 10 miles to Best Buy to gawk at the new TVs. After drooling over 80" televisions in 4k HDR for 30 minutes, I return to my car to head home. It is still 100 degrees outside. However, the AC, with the same settings, doesn't get nearly as cold as before. It can take 10+ minutes to get as cold as before, sometimes more if I'm driving slowly in the city with 30 mph speed limits and plenty of stop lights.
Comparatively, the same exact scenario in the Lexus, getting back in the car after leaving Best Buy and the AC will be ice cold in under 2 minutes.
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billiam01 (08-09-2017)
#38
That's all I use during the summer except for the first 5 minutes. During that short time I run with the windows down and outside air coming in. An A/C is only designed to cool air temps by 20-30 degrees. When you turn on re-circulation is it cooling down already cooled air. So temps drop a lot faster and stay there.
#39
Team Owner
Check out the Llumar Air line of window films. I went with Air 90 on my windshield and it makes a noticeable difference.
http://www.llumar.com/choose-a-produ...r-window-films
With that on the windshield, plus Llumar Ceramatix 30% on the sides and back, my A/C has no problem cooling the cabin after it's been sitting outside in the sun, or keeping the cabin cool on a drive.
http://www.llumar.com/choose-a-produ...r-window-films
With that on the windshield, plus Llumar Ceramatix 30% on the sides and back, my A/C has no problem cooling the cabin after it's been sitting outside in the sun, or keeping the cabin cool on a drive.
The following users liked this post:
joemessman (07-22-2016)