C68
Thread Starter
Drifting
Joined: Jul 2009
Posts: 1,257
Likes: 98
From: Ashland PA
2021 C4 of the Year - Modified Finalist
C68
On my C68 climate control I ether have to set it to 90 for good heat or 60 for good cold air, if I set it to say 75 it does not seem to hold that temp. I have no codes on the C68 it just seems to always been that way. I was wondering if they were like that from new.
Melting Slicks
Joined: Jan 2001
Posts: 2,996
Likes: 303
From: MOORESVILLE NC
Pull the Blower Control Module out (in the engine bay). Shine a flash light into the hole and look toward the firewall. Get a helper to adjust the Temperature up and down. You be able to see the door move that allows cold and hot air into the cabin. You will also see the Heater core. Let us know what you see at 60, 75, and 90.
Race Director
Joined: Apr 2002
Posts: 10,036
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From: Anaheim CA
The C68 system was completely redesigned in 1990, so it's important to know what year your car is.
Is your car a '96? If so, see this thread:
https://www.corvetteforum.com/forums...l-problem.html
For reference, when looking through the evaporator housing opening the temperature blend door should look like this in the 60° position:
It should look like this in the 90° position:
Is your car a '96? If so, see this thread:
https://www.corvetteforum.com/forums...l-problem.html
For reference, when looking through the evaporator housing opening the temperature blend door should look like this in the 60° position:
It should look like this in the 90° position:
Last edited by Cliff Harris; Apr 14, 2015 at 11:22 PM.
Thread Starter
Drifting
Joined: Jul 2009
Posts: 1,257
Likes: 98
From: Ashland PA
2021 C4 of the Year - Modified Finalist
OK the blend door is working it fully blocks the heater core when set at 60 and fully goes the other-way at 90, it goes to the same position at 70 as it is at 90.
Last edited by eutu1984; Apr 15, 2015 at 07:18 PM. Reason: add
Thread Starter
Drifting
Joined: Jul 2009
Posts: 1,257
Likes: 98
From: Ashland PA
2021 C4 of the Year - Modified Finalist
My real question is if anyone with the C68 system does yours stay at say 75 when you set it there or does it do the same as mine.
Last edited by eutu1984; Apr 15, 2015 at 06:52 PM. Reason: add
Thread Starter
Drifting
Joined: Jul 2009
Posts: 1,257
Likes: 98
From: Ashland PA
2021 C4 of the Year - Modified Finalist
Melting Slicks
Joined: Jan 2001
Posts: 2,996
Likes: 303
From: MOORESVILLE NC
The only time of year I would say the interior is warmer than 75 is in July and August. I have to lower the temp. to 68 - 70 to feel comfortable.
My C68 is a 88. I just had the AC/Heater programmer repaired by BATEE.COM. My Blend door would get stuck in the 60 -65 setting and when last November came along I had no heat.
My C68 is a 88. I just had the AC/Heater programmer repaired by BATEE.COM. My Blend door would get stuck in the 60 -65 setting and when last November came along I had no heat.
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Race Director
Joined: Apr 2002
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From: Anaheim CA
The resistors in question are in the lower left corner of the PC board in this picture. You can see that the PC board is discolored from the heat:
Thread Starter
Drifting
Joined: Jul 2009
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From: Ashland PA
2021 C4 of the Year - Modified Finalist
I had the programmer out when I first got the car to fix a vacuum leak, my controller is different than the one in your pic Chris, it does not have the two big resisters in the lower left.
Thread Starter
Drifting
Joined: Jul 2009
Posts: 1,257
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From: Ashland PA
2021 C4 of the Year - Modified Finalist
the inside of my programmer looks like this one
http://galleryplus.ebayimg.com/ws/we..._1/500x500.jpg
http://galleryplus.ebayimg.com/ws/we..._1/500x500.jpg
Racer
Joined: Sep 2014
Posts: 429
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From: Brooklyn, MI
the inside of my programmer looks like this one
http://galleryplus.ebayimg.com/ws/we..._1/500x500.jpg
http://galleryplus.ebayimg.com/ws/we..._1/500x500.jpg
Racer
Joined: Sep 2014
Posts: 429
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From: Brooklyn, MI
Thread Starter
Drifting
Joined: Jul 2009
Posts: 1,257
Likes: 98
From: Ashland PA
2021 C4 of the Year - Modified Finalist
I understand its age related Rob but I am going to try and trouble shoot it to see if I can get it to work correctly. I am looking through the FSM and am going to try and check all the perimeters to see if it is anything else before I mess with the programmer. Right now I am busy with the front spring. https://www.corvetteforum.com/forums...af-spring.html
Race Director
Joined: Apr 2002
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From: Anaheim CA