AC Blending Doors Do Not Work
Thread Starter
Burning Brakes
Joined: May 2007
Posts: 887
Likes: 1
From: Dallas TX
AC Blending Doors Do Not Work
I have a 2002 Z06 with the Digital control panel AC unit and if I have it set to anything other than 60 the air coming out is as hot as if I had it on 90. I have heard that the blending doors to control that is electronically controlled. I would greatly appreciate it if someone could explain to me how to fix this problem.
Burning Brakes
Joined: Jan 2004
Posts: 1,158
Likes: 6
From: Winter Springs Fla
There are several ways to reset the doors .
First try turning the key on , resetting codes in the DIC , turn the key off wait 10 seconds and start the car and check to see if the a/c blows cold .The car will throw codes if the doors are not in the right place .
If that dosnt work try pulling the a/c fuse under the passanger side floor board access panel , turn on the key , wait 30 seconds , turn off the key , wait 30 seconds , put the fuse back in and start the car and check a/c .
Try pulling the positive battery cable off the battery , wait 30 seconds and reconnect , start car and check a/c .
If none of that works , you probley have a bad digital controler unit .
First try turning the key on , resetting codes in the DIC , turn the key off wait 10 seconds and start the car and check to see if the a/c blows cold .The car will throw codes if the doors are not in the right place .
If that dosnt work try pulling the a/c fuse under the passanger side floor board access panel , turn on the key , wait 30 seconds , turn off the key , wait 30 seconds , put the fuse back in and start the car and check a/c .
Try pulling the positive battery cable off the battery , wait 30 seconds and reconnect , start car and check a/c .
If none of that works , you probley have a bad digital controler unit .
Last edited by zoomz; Jan 24, 2008 at 12:07 AM.
Thread Starter
Burning Brakes
Joined: May 2007
Posts: 887
Likes: 1
From: Dallas TX
There are several ways to reset the doors .
First try turning the key on , resetting codes in the DIC , turn the key off wait 10 seconds and start the car and check to see if the a/c blows cold .The car will throw codes if the doors are not in the right place .
If that dosnt work try pulling the a/c fuse under the passanger side floor board access panel , turn on the key , wait 30 seconds , turn off the key , wait 30 seconds , put the fuse back in and start the car and check a/c .
Try pulling the positive battery cable off the battery , wait 30 seconds and reconnect , start car and check a/c .
If none of that works , you probley have a bad digital controler unit .
First try turning the key on , resetting codes in the DIC , turn the key off wait 10 seconds and start the car and check to see if the a/c blows cold .The car will throw codes if the doors are not in the right place .
If that dosnt work try pulling the a/c fuse under the passanger side floor board access panel , turn on the key , wait 30 seconds , turn off the key , wait 30 seconds , put the fuse back in and start the car and check a/c .
Try pulling the positive battery cable off the battery , wait 30 seconds and reconnect , start car and check a/c .
If none of that works , you probley have a bad digital controler unit .
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
This worked very well for me:
Turn the key to ON, enter the diagnostic routiene in the DIC and go to the HVAC page. Once there, turn the HVAC control module "OFF" using the OFF button on the control head
Clear all the HVAC DTCs in the DIC using the reset button.
Turn the HVAC system back on. You will hear the actuators cycle. If the actuators cycle and the codes pop back up, do the procedure again. You may need to do this a bunch of times. I had to do it six times and have NOT had a problem since. All the codes cleared and the unit works normal again.
BC
BC
Turn the key to ON, enter the diagnostic routiene in the DIC and go to the HVAC page. Once there, turn the HVAC control module "OFF" using the OFF button on the control head
Clear all the HVAC DTCs in the DIC using the reset button.
Turn the HVAC system back on. You will hear the actuators cycle. If the actuators cycle and the codes pop back up, do the procedure again. You may need to do this a bunch of times. I had to do it six times and have NOT had a problem since. All the codes cleared and the unit works normal again.
BC
BC
Thread Starter
Burning Brakes
Joined: May 2007
Posts: 887
Likes: 1
From: Dallas TX
This worked very well for me:
Turn the key to ON, enter the diagnostic routiene in the DIC and go to the HVAC page. Once there, turn the HVAC control module "OFF" using the OFF button on the control head
Clear all the HVAC DTCs in the DIC using the reset button.
Turn the HVAC system back on. You will hear the actuators cycle. If the actuators cycle and the codes pop back up, do the procedure again. You may need to do this a bunch of times. I had to do it six times and have NOT had a problem since. All the codes cleared and the unit works normal again.
BC
BC
Turn the key to ON, enter the diagnostic routiene in the DIC and go to the HVAC page. Once there, turn the HVAC control module "OFF" using the OFF button on the control head
Clear all the HVAC DTCs in the DIC using the reset button.
Turn the HVAC system back on. You will hear the actuators cycle. If the actuators cycle and the codes pop back up, do the procedure again. You may need to do this a bunch of times. I had to do it six times and have NOT had a problem since. All the codes cleared and the unit works normal again.
BC
BC
Thread Starter
Burning Brakes
Joined: May 2007
Posts: 887
Likes: 1
From: Dallas TX
This worked very well for me:
Turn the key to ON, enter the diagnostic routiene in the DIC and go to the HVAC page. Once there, turn the HVAC control module "OFF" using the OFF button on the control head
Clear all the HVAC DTCs in the DIC using the reset button.
Turn the HVAC system back on. You will hear the actuators cycle. If the actuators cycle and the codes pop back up, do the procedure again. You may need to do this a bunch of times. I had to do it six times and have NOT had a problem since. All the codes cleared and the unit works normal again.
BC
BC
Turn the key to ON, enter the diagnostic routiene in the DIC and go to the HVAC page. Once there, turn the HVAC control module "OFF" using the OFF button on the control head
Clear all the HVAC DTCs in the DIC using the reset button.
Turn the HVAC system back on. You will hear the actuators cycle. If the actuators cycle and the codes pop back up, do the procedure again. You may need to do this a bunch of times. I had to do it six times and have NOT had a problem since. All the codes cleared and the unit works normal again.
BC
BC
Thread Starter
Burning Brakes
Joined: May 2007
Posts: 887
Likes: 1
From: Dallas TX
No the passenger side stays consistent with the driver side. From 61-90 it is the same HOT!!!. But 60 it blows ICE Cold like it should. I have not started it and tried it since I reset the codes a few times and hopefully that fixed it but we will see.
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Race Director
Joined: Jul 2007
Posts: 10,959
Likes: 2,641
From: Texas Hill Country
I was trying to say that MY problem is the passenger side always blowing cold with the heater on....
Thread Starter
Burning Brakes
Joined: May 2007
Posts: 887
Likes: 1
From: Dallas TX
Oh sorry misunderstood. My problem still persists. I cleared the codes a few times and then went home from work and tried the system and it blows hot from 61-90 but as soon as I turn it to 60 I can hear something moving and it blows cold. I will try to clear the codes a few more times even though it didnt have any codes and I will try the other suggestions if that doesnt work.
Le Mans Master
Joined: May 2006
Posts: 5,987
Likes: 18
From: DuBois PA
St. Jude Donor '11-'12-'13-'14-'15
This worked very well for me:
Turn the key to ON, enter the diagnostic routine in the DIC and go to the HVAC page. Once there, turn the HVAC control module "OFF" using the OFF button on the control head
Clear all the HVAC DTCs in the DIC using the reset button.
Turn the HVAC system back on. You will hear the actuators cycle. If the actuators cycle and the codes pop back up, do the procedure again. You may need to do this a bunch of times. I had to do it six times and have NOT had a problem since. All the codes cleared and the unit works normal again.
BC
BC
Turn the key to ON, enter the diagnostic routine in the DIC and go to the HVAC page. Once there, turn the HVAC control module "OFF" using the OFF button on the control head
Clear all the HVAC DTCs in the DIC using the reset button.
Turn the HVAC system back on. You will hear the actuators cycle. If the actuators cycle and the codes pop back up, do the procedure again. You may need to do this a bunch of times. I had to do it six times and have NOT had a problem since. All the codes cleared and the unit works normal again.
BC
BC
You can also press and hold the reset button while in the 99-HVAC screen of the Diags...
Hey? How much snow have you got?
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Adam
Ive thinking about your issue. This issue is most likely related to one of the following conditions:
Your HVAC control head is defective. Most likely due to a poor solder joint (very common problem.) If I were you,, I would open it up and examine the circuit boards and look for poorly soldered components and circuits. Either that or buy a rebuilt one or a new one.
The effected controller has a bad feed back potentiometer or the signal isn't getting to the controller. You would need a meter to read the driver voltage and the feed back voltage. Heres a picture of the controller and the guts:
Bill
Ive thinking about your issue. This issue is most likely related to one of the following conditions:
Your HVAC control head is defective. Most likely due to a poor solder joint (very common problem.) If I were you,, I would open it up and examine the circuit boards and look for poorly soldered components and circuits. Either that or buy a rebuilt one or a new one.
The effected controller has a bad feed back potentiometer or the signal isn't getting to the controller. You would need a meter to read the driver voltage and the feed back voltage. Heres a picture of the controller and the guts:
Bill
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
The HVAC Vacuum system is used for the vent doors which control Bi-level, upper, lower vents and the recirc and fresh air damper. It does not control temp.
If you loose vacuum you will loose the ability to change damper doors circulation doors.
BC
If you loose vacuum you will loose the ability to change damper doors circulation doors.
BC
Le Mans Master
Joined: May 2006
Posts: 5,987
Likes: 18
From: DuBois PA
St. Jude Donor '11-'12-'13-'14-'15
Le Mans Master
Joined: May 2006
Posts: 5,987
Likes: 18
From: DuBois PA
St. Jude Donor '11-'12-'13-'14-'15
Adam
Ive thinking about your issue. This issue is most likely related to one of the following conditions:
Your HVAC control head is defective. Most likely due to a poor solder joint (very common problem.) If I were you,, I would open it up and examine the circuit boards and look for poorly soldered components and circuits. Either that or buy a rebuilt one or a new one.
The effected controller has a bad feed back potentiometer or the signal isn't getting to the controller. You would need a meter to read the driver voltage and the feed back voltage. Heres a picture of the controller and the guts:
Bill
Ive thinking about your issue. This issue is most likely related to one of the following conditions:
Your HVAC control head is defective. Most likely due to a poor solder joint (very common problem.) If I were you,, I would open it up and examine the circuit boards and look for poorly soldered components and circuits. Either that or buy a rebuilt one or a new one.
The effected controller has a bad feed back potentiometer or the signal isn't getting to the controller. You would need a meter to read the driver voltage and the feed back voltage. Heres a picture of the controller and the guts:
Bill
FYI Adam if need be there is a really good repair service on Fleabay that alot of owners have used to get thier HVAC unit fixed.
Last edited by tstar; Feb 1, 2008 at 01:07 AM.
Burning Brakes
Joined: Aug 2004
Posts: 770
Likes: 0
Following along here as I have a '98 with a dual zone hvac problem. Late summer I noticed a problem with cooling. D/Side vents about 15 degrees warmer than pass side. No codes in DIC, hvac or other. Did the acuator reset in the manual, which was pull fuse in pass footwell. Also tried reset by pulling battery leads. No help.
Now when using the heating mode, I notice that set at 60 degrees no heat coming out of vents. At 61 degrees full heat comes out of vents.
Sounds sort of similar to O/P's problem.
Now when using the heating mode, I notice that set at 60 degrees no heat coming out of vents. At 61 degrees full heat comes out of vents.
Sounds sort of similar to O/P's problem.
Thread Starter
Burning Brakes
Joined: May 2007
Posts: 887
Likes: 1
From: Dallas TX
Following along here as I have a '98 with a dual zone hvac problem. Late summer I noticed a problem with cooling. D/Side vents about 15 degrees warmer than pass side. No codes in DIC, hvac or other. Did the acuator reset in the manual, which was pull fuse in pass footwell. Also tried reset by pulling battery leads. No help.
Now when using the heating mode, I notice that set at 60 degrees no heat coming out of vents. At 61 degrees full heat comes out of vents.
Sounds sort of similar to O/P's problem.
Now when using the heating mode, I notice that set at 60 degrees no heat coming out of vents. At 61 degrees full heat comes out of vents.
Sounds sort of similar to O/P's problem.
Racer
Joined: Dec 2004
Posts: 455
Likes: 11
From: Clovis CA
sorry to highjack, but i've posted about my hvac problem and haven't gotten any responses there.
my problem is that the heater doesn't blow hot at all. the system blows through whatever vents are turned on, heat-def-bi level etc., but only blows cool air no matter what i have temp set at. a/c works great....
dual climate system also.
my problem is that the heater doesn't blow hot at all. the system blows through whatever vents are turned on, heat-def-bi level etc., but only blows cool air no matter what i have temp set at. a/c works great....
dual climate system also.