1989 ac
Thread Starter
Burning Brakes
Joined: Jul 2017
Posts: 750
Likes: 86
From: St Petersburg
1989 ac
We just re built the HVAC and the programmer with parts purchase at Batee.com
All the buttons work now as they should but still the ac is still blowing threw dash vents and out the upper windshield defroster so split power
some vents or door isn't opening I assume because of the vacuum system but hard to tell it's all hidden. what ever air that is working is cold or at least "cool"
I'm also wondering if since that system is 32 yrs old can I upgrade the Fan motor to more output ?
without AC in Florida the car is useless
All the buttons work now as they should but still the ac is still blowing threw dash vents and out the upper windshield defroster so split power
some vents or door isn't opening I assume because of the vacuum system but hard to tell it's all hidden. what ever air that is working is cold or at least "cool"
I'm also wondering if since that system is 32 yrs old can I upgrade the Fan motor to more output ?
without AC in Florida the car is useless
Thread Starter
Burning Brakes
Joined: Jul 2017
Posts: 750
Likes: 86
From: St Petersburg
This is what Bryan said I in e mail, I have no heater core
OK, so it sounds like the blend door motor is bad, but it doesn't matter because the heater core is bypassed, so it's full cold all the time.
I think a vacuum leak is responsible for air coming out the wrong vents. Make sure the programmer is mounted to the firewall before testing. It won't work right otherwise.
Thank you,
Bryan Thompson
OK, so it sounds like the blend door motor is bad, but it doesn't matter because the heater core is bypassed, so it's full cold all the time.
I think a vacuum leak is responsible for air coming out the wrong vents. Make sure the programmer is mounted to the firewall before testing. It won't work right otherwise.
Thank you,
Bryan Thompson
Last edited by BillDurant; Mar 30, 2021 at 10:20 AM.
Pro
Joined: Apr 2011
Posts: 628
Likes: 80
From: Canada
Bill, I had a similar problem where the vents/door wasn't opening/closing fully and heat was pouring out by my legs when my heater was off. Don't know if this will help, but it was the HVAC programmer module located just above the gas peddle. See thread below.
Heat while driving, but my heater is off
https://www.corvetteforum.com/forums...post1595312569
Heat while driving, but my heater is off
https://www.corvetteforum.com/forums...post1595312569
Thread Starter
Burning Brakes
Joined: Jul 2017
Posts: 750
Likes: 86
From: St Petersburg
we put it all pack together HVAC buttons work programmer seems to work but the center door just under the dash closes really slow and opens fast but doesn't close all the way 1" still left open not enough air blowing threw the system
Last edited by BillDurant; Mar 30, 2021 at 02:43 PM.
Drifting
Joined: Feb 2008
Posts: 1,537
Likes: 178
From: NE Ohio
2024 C4 of the Year Finalist - Unmodified
IDK maybe Vac line that pulls it closed is leaking or pinched.
Last edited by kenmohr; Mar 31, 2021 at 06:51 AM.
Le Mans Master
Joined: Jul 2004
Posts: 6,228
Likes: 698
From: Clifton Park, NY ............Clearwater, FL ... 85 Original Owner
My 85 had it's vac lines (in back of radio) chewed in half by mice. Did you check when you had the radio and programmer out?
Last edited by Cruisinfanatic; Mar 31, 2021 at 08:15 AM.
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