Go Back  CorvetteForum - Chevrolet Corvette Forum Discussion > C7 Corvette > C7 General Discussion
Reload this Page >

C7 Heater -only works on "HI". No difference between 61-89 degree settings

C7 General Discussion General C7 Corvette Discussion not covered in Tech
Sponsored by:
Sponsored by:

C7 Heater -only works on "HI". No difference between 61-89 degree settings

 
Old 03-29-2018, 02:24 AM
  #1  
05XLRtoC7_San Diego
CF Senior Member
Thread Starter
 
05XLRtoC7_San Diego's Avatar
 
Member Since: Apr 2015
Location: San Diego
Posts: 726
Liked 89 Times in 62 Posts
Default C7 Heater -only works on "HI". No difference between 61-89 degree settings

Hi All,
Not sure if this is a quirk with my 2015 Corvette Convertible, if I'm doing something wrong, or if there is something broken.

There is absolutely NO difference in air temperature from the 4 upper heat vents if I have the temp set from 61 to 89 degrees (manual mode).
For example, setting it at 61 feels like 75 and like 89.

The only way I can get the car to blow very hot air is to have it set as "HI".
So it's either very luke warm (61-89) or roasting hot (HI)......nothing in between.

I've tried setting it on 89 degrees and AUTO mode, yet hardly any air comes out of the vents even on a cold night where it's 60 degrees out.

Any idea what could be wrong?
I miss the days of basic climate control systems that were reliable.

Thanks
Attached Images     
05XLRtoC7_San Diego is offline  
Old 03-29-2018, 06:12 AM
  #2  
cowboy casey
CF Senior Member
 
cowboy casey's Avatar
 
Member Since: Nov 2013
Posts: 776
Liked 215 Times in 167 Posts
Default

Heat will not come out of those vents on auto, never happen... Mine takes about 10 to 15 minutes before heat starts working good (feet and windshield).. set it at 80 degrees on auto and after 10 minutes or so it will start to heat the cab up.. I have driven in -10 degrees and the lower the degrees out the longer it takes to heat...
cowboy casey is offline  
The following users liked this post: cowboy casey
woodsguy (03-29-2018)
Old 03-29-2018, 07:40 AM
  #3  
rrsperry
CF Senior Member
 
rrsperry's Avatar
 
Member Since: Sep 2015
Posts: 2,602
Liked 403 Times in 259 Posts
Default

On my 16, I've never taken it out of auto. It works fine.Just change the temp and it works.

Perhaps you should have it looked at.
rrsperry is offline  
Old 03-29-2018, 08:57 PM
  #4  
05XLRtoC7_San Diego
CF Senior Member
Thread Starter
 
05XLRtoC7_San Diego's Avatar
 
Member Since: Apr 2015
Location: San Diego
Posts: 726
Liked 89 Times in 62 Posts
Default

Originally Posted by cowboy casey View Post
Heat will not come out of those vents on auto, never happen... Mine takes about 10 to 15 minutes before heat starts working good (feet and windshield).. set it at 80 degrees on auto and after 10 minutes or so it will start to heat the cab up.. I have driven in -10 degrees and the lower the degrees out the longer it takes to heat...
Hmmmm...that's interesting. Which vents does the heat below on Auto?
My car was fully warmed up.
It can blow hot air, but only on the HI setting.
05XLRtoC7_San Diego is offline  
Old 03-29-2018, 08:57 PM
  #5  
05XLRtoC7_San Diego
CF Senior Member
Thread Starter
 
05XLRtoC7_San Diego's Avatar
 
Member Since: Apr 2015
Location: San Diego
Posts: 726
Liked 89 Times in 62 Posts
Default

Originally Posted by rrsperry View Post
On my 16, I've never taken it out of auto. It works fine.Just change the temp and it works.

Perhaps you should have it looked at.
Thanks- sounds like something must be wrong. I only have 2 months of warranty left, so need to get it checked out soon.
05XLRtoC7_San Diego is offline  
Old 03-30-2018, 10:04 AM
  #6  
Blue-C7 of Jax
CF Senior Member
 
Blue-C7 of Jax's Avatar
 
Member Since: Sep 2001
Location: Jacksonville FL
Posts: 3,088
Liked 475 Times in 370 Posts
Default

My 15 has a mind of its own. In FL I use air almost everyday and I have to turn the air to LO to get cold on some days and on other days it is cold at 72. Heat really doesn't work on auto. My AC/Heat has done this since day one. As long as I can get cold and hot air from the system, I will stay away from the dealer. I do have the extended warranty if either stops working.
Blue-C7 of Jax is offline  
Old 03-30-2018, 06:57 PM
  #7  
05XLRtoC7_San Diego
CF Senior Member
Thread Starter
 
05XLRtoC7_San Diego's Avatar
 
Member Since: Apr 2015
Location: San Diego
Posts: 726
Liked 89 Times in 62 Posts
Default

Originally Posted by Red-C6 of Jax View Post
My 15 has a mind of its own. In FL I use air almost everyday and I have to turn the air to LO to get cold on some days and on other days it is cold at 72. Heat really doesn't work on auto. My AC/Heat has done this since day one. As long as I can get cold and hot air from the system, I will stay away from the dealer. I do have the extended warranty if either stops working.
Interesting to read your 2015 climate control has been acting up as well.
Usually, I want max cold or max hot with the top down, but it would be nice to have some temp in between
05XLRtoC7_San Diego is offline  
Old 03-31-2018, 07:57 AM
  #8  
VistaVette
CF Senior Member
 
VistaVette's Avatar
 
Member Since: Mar 2005
Location: Las Vegas NV
Posts: 439
Liked 96 Times in 70 Posts
Default

IMO this is the issue with auto climate control, which trys to regulate the inside cabin temp to the number on the dial. What you're after (and what I want) is to regulate the air temp coming out of the vents, which is something climate control doesn't do (regardless if you're in auto or not). Unless you have the thermostat set to an extreme (hi or low) you get what you get. BMW has it figured out and includes a little wheel that allows you to control the actual air temp and it works as a great compromise with an automatic system.

This topic is a pet peeve of mine as I hate climate control. I want to control the air temps, not the cabin temps which I never find works (at least here in Las Vegas where the outside temps might be okay but the unfiltered desert sun beams into the car like a laser and cooks you faster than a microwave). I find most of the time I just want the air a little cooler or a little warmer etc. Which is something any old HVaC system from decades ago did perfectly fine.
VistaVette is offline  
The following users liked this post: VistaVette
VNAMVET (03-31-2018)
Old 03-31-2018, 08:22 AM
  #9  
CP
CF Senior Member
 
Member Since: Aug 2000
Location: Spring Texas
Posts: 19,729
Liked 245 Times in 146 Posts
Default

You need to be like Ron Popiel: Set it and forget it.
CP is offline  
Old 03-31-2018, 08:47 AM
  #10  
NSC5
CF Senior Member
Support Corvetteforum!
 
NSC5's Avatar
 
Member Since: Aug 2012
Posts: 3,905
Liked 1,026 Times in 697 Posts
Default

In auto mode in cold weather with heat selected the system will run in a bi-level blend mode with hot air primarily coming out of the lower outlets and no or moderate temperature air coming out of the top. The temperature blend will be biased further towards heat from the lower outlets if the cabin light/sun sensor detects bright sunlight because it is assumed that will further heat the upper part of the driver and passenger. This is the way most systems have worked for years.

If you manually put the system into upper only with heat it is still going to stick with its logic of not putting very hot air out of the upper vents and will take MUCH longer to heat the cabin up. As you have found the only way to override this is setting the temperature to maximum.

We have reached the point where manufacturers have largely adopted the "we know better than you" and many systems are designed to enforce the designer's beliefs and preferences. Microsoft Win 10 is a classic example where user control has been drastically reduced from earlier versions.

My 2014 Cadillac ATS heater works much like that in my 2016 Z06 and I have been happy with its auto mode performance but about a year ago when I had an older relative in the car I ran into the same issue you did with your Corvette in trying to convince the system to put out hot air from the upper vents. Putting the system in recirc mode (watch out for fogging) does reduce warm-up time. At least my Corvette has an A/C off button so you can easily run vent only without engaging the compressor when conditions are nice. With the Cadillac I have to go into the CUE system additional climate controls to turn the compressor off.

Last edited by NSC5; 03-31-2018 at 08:47 AM.
NSC5 is offline  
Old 03-31-2018, 09:54 AM
  #11  
plasboy
CF Senior Member
 
plasboy's Avatar
 
Member Since: Sep 2011
Location: Licking MO
Posts: 1,178
Liked 76 Times in 69 Posts
Default

There are some tsb’s out for problems like yours. I have a somewhat similar problem with mine and have been trying to get it fixed for over a year. Got it in front of head HVAC engineer for Corvette now and he’s talking like they might be able to figure out something.
Make the dealer check for tsb’s.
plasboy is offline  
Old 03-31-2018, 12:38 PM
  #12  
b4i4getit
CF Senior Member
 
b4i4getit's Avatar
 
Member Since: Oct 2004
Location: Toronto Ontario Canada
Posts: 6,770
Liked 244 Times in 169 Posts
Default

Dealer visit while you still have warranty.
b4i4getit is offline  
Old 03-31-2018, 01:47 PM
  #13  
fsvoboda
CF Senior Member
 
Member Since: Sep 2013
Posts: 2,095
Liked 388 Times in 284 Posts
Default

Originally Posted by b4i4getit View Post
Dealer visit while you still have warranty.
Yes. Just get it looked at and repaired under warranty.

In old systems a fan that would run only in high would be a classic case of blower resistor failure, a very easy and cheap repair. (I had one of these repaired in 2005 for $58.88 including labor.) However, I've got no idea what's up with your car.

fsvoboda is offline  
 


Thread Tools
Search this Thread
Quick Reply: C7 Heater -only works on "HI". No difference between 61-89 degree settings


Sponsored Ads
Vendor Directory

Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: