AC blows cold on passenger side only
Thread Starter
Instructor
Joined: Jun 2015
Posts: 245
Likes: 10
From: Kansas City (Lees Summit) Missouri
AC blows cold on passenger side only
warm or hot air only on drivers side and the cold air only on passenger side
99 base with dual zone climate control
the drivers side **** works. The temps adjust when you turn the ****. It just started doing this in the last couple days.
Short on time. Can someone plz point me in the right direction
99 base with dual zone climate control
the drivers side **** works. The temps adjust when you turn the ****. It just started doing this in the last couple days.
Short on time. Can someone plz point me in the right direction
Thread Starter
Instructor
Joined: Jun 2015
Posts: 245
Likes: 10
From: Kansas City (Lees Summit) Missouri
Hmm no codes. So is there two evaps for this dual climate setup? AC always underperformed so low freon is making sense.
My cheapo gauge isn't working. Thanks for the info so far.
My cheapo gauge isn't working. Thanks for the info so far.
Drifting
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
There is only one evaporator. With no codes it is most likely low on r134 (freon) and needs a charge. If it is low that also means you have a leak somewhere. Be sure it is recharged with dye or use a sniffer to find the leak. Did you use the dic to check for codes? A regular scanner will not pick up hvac codes and a bad actuator will cause the same problem.
Thread Starter
Instructor
Joined: Jun 2015
Posts: 245
Likes: 10
From: Kansas City (Lees Summit) Missouri
Must be a bad actuator and I could use some help locating it. Picked up a temp air door actuator from O'reily's for $140.
Gonna go search for info.
Are these actuators repairable?
Gonna go search for info.
Are these actuators repairable?
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Drifting
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
Did you use the dic and pull the codes? A bad actuator will set a code and tell you which side has the problem. They can sometimes be re calibrated and work although this is usually temporary. Try clearing the code and see if it returns. You must pull the codes as low freon will cause the same problem. Sometimes a plastic gear in the actuator will break and can be repaired. A search will find the diy fix but it seems like a pita. Replacing it is also a pita due to its location under the dash. Most people pull the dash for access.
Le Mans Master
Joined: Feb 2012
Posts: 6,644
Likes: 479
From: OK
C5 Re-Calibrating Actuators
Use the following steps to perform the calibration update:
1. Turn OFF the ignition.
2. Remove the battery positive voltage circuit fuse of the HVAC Control Module (fuse #27).
Important
The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.
3. Wait 60 seconds.
4. Install the fuse.
https://www.corvetteforum.com/forums...actuators.html
Use the following steps to perform the calibration update:
1. Turn OFF the ignition.
2. Remove the battery positive voltage circuit fuse of the HVAC Control Module (fuse #27).
Important
The module memory will not clear if the battery positive voltage circuit fuse is installed in less than 60 seconds.
3. Wait 60 seconds.
4. Install the fuse.
https://www.corvetteforum.com/forums...actuators.html
Race Director
Joined: Mar 2008
Posts: 12,413
Likes: 502
From: Rio Rancho NM
Drifting
Joined: Jun 2013
Posts: 1,965
Likes: 343
From: Shell Point (Crawfordville) Florida
Sorry for the rant, but -- I just love it when people come on here and every other forum and ask a question, get good advice, then go out and do whatever they want and spend all kinds of unnecessary money to try and shotgun fix their problem. Even though they asked for advice, they think they're smarter than everyone here. Then, when their solution didn't work, they come back and ask for more advice instead of listening to what they were told the first time around.
You have no codes? You're short on time? Then check the friggin' freon. Being low on freon is much, much, more likely than a bad actuator, and is way less expensive to fix, and takes maybe 5-10 min. instead of what you are planing to do. It's a very common cause of your problem. Go to Walmart, Autozone, any auto parts place and get a can of refrigerant in a kit with a filer hose and pressure gauge attached, read the directions (2-3 min at most), hook it to the low side AC line and squeeze away. I bet your problem is solved in 5 min, not 5 hours for the direction you seem to want to go in.
You have no codes? You're short on time? Then check the friggin' freon. Being low on freon is much, much, more likely than a bad actuator, and is way less expensive to fix, and takes maybe 5-10 min. instead of what you are planing to do. It's a very common cause of your problem. Go to Walmart, Autozone, any auto parts place and get a can of refrigerant in a kit with a filer hose and pressure gauge attached, read the directions (2-3 min at most), hook it to the low side AC line and squeeze away. I bet your problem is solved in 5 min, not 5 hours for the direction you seem to want to go in.
Last edited by mrlmd; Jul 27, 2015 at 04:25 PM.
Le Mans Master
Joined: Feb 2012
Posts: 6,644
Likes: 479
From: OK
Sorry for the rant, but -- I just love it when people come on here and every other forum and ask a question, get good advice, then go out and do whatever they want and spend all kinds of unnecessary money to try and shotgun fix their problem. Even though they asked for advice, they think they're smarter than everyone here. Then, when their solution didn't work, they come back and ask for more advice instead of listening to what they were told the first time around.
You have no codes? You're short on time? Then check the friggin' freon. Being low on freon is much, much, more likely than a bad actuator, and is way less expensive to fix, and takes maybe 5-10 min. instead of what you are planing to do. It's a very common cause of your problem. Go to Walmart, Autozone, any auto parts place and get a can of refrigerant in a kit with a filer hose and pressure gauge attached, read the directions (2-3 min at most), hook it to the low side AC line and squeeze away. I bet your problem is solved in 5 min, not 5 hours for the direction you seem to want to go in.
You have no codes? You're short on time? Then check the friggin' freon. Being low on freon is much, much, more likely than a bad actuator, and is way less expensive to fix, and takes maybe 5-10 min. instead of what you are planing to do. It's a very common cause of your problem. Go to Walmart, Autozone, any auto parts place and get a can of refrigerant in a kit with a filer hose and pressure gauge attached, read the directions (2-3 min at most), hook it to the low side AC line and squeeze away. I bet your problem is solved in 5 min, not 5 hours for the direction you seem to want to go in.
Pretty simple to try...
Thread Starter
Instructor
Joined: Jun 2015
Posts: 245
Likes: 10
From: Kansas City (Lees Summit) Missouri
It's not low on freon.
I still need help. I disconnected the battery cables today for twenty mins and it started blowing ICE COLD 40 degree air out of all vents. Which is awesome
But if I turn the temp dial for drivers side, it'll go back to warm air on drivers side and not respond anymore. Then tonight the blower speed started ignoring commands. I could turn it all the way up and it would hesitate until repeated pushing the up button. Then it will not turn down, even though the digital display follows the button pressed commands.
I did check for codes days ago, and again today, and there are no HVAC codes "NO CODES"
I can hear an actuator motor constantly buzzing "buzz buzz buzzzzz" whole time the HVAC is on. Gonna dig into it in a day or so. Any feedback is appreciated.
Last edited by WildRide357; Jul 28, 2015 at 01:07 AM.
Le Mans Master
Joined: Mar 2011
Posts: 6,835
Likes: 302
From: Columbia SC
May be an issue with the control unit with no codes and did blow cold air. It would be nice to swap another one in and see if you had access to one. I have done that for others and it is about the only way to rule a unit in or out when weird things happen. You can get used ones for a little more than that actuator costs. Marc at VetteNuts.com would be a good source if you try that. He is a Forum vendor here.
With regard to the blower motor it has a Control Processor that is all electronic and next to the motor. If you had a plugged A/C drain udder you could get water backup and fail it and/or the motor. That can also put water into passenger foot well where the BCM and serial bus connectors are. Check it for moisture.
Try disconnecting the battery again and see if the drain drips water out where it should near the battery at the back of the engine with the A/C on. Would also like to see what happens when you try to adjust temps later. Let the A/C run long enough to see if the drain works. I would however see if the foot well is damp first. No sense in adding more.
Mr. Sam
With regard to the blower motor it has a Control Processor that is all electronic and next to the motor. If you had a plugged A/C drain udder you could get water backup and fail it and/or the motor. That can also put water into passenger foot well where the BCM and serial bus connectors are. Check it for moisture.
Try disconnecting the battery again and see if the drain drips water out where it should near the battery at the back of the engine with the A/C on. Would also like to see what happens when you try to adjust temps later. Let the A/C run long enough to see if the drain works. I would however see if the foot well is damp first. No sense in adding more.
Mr. Sam
Thread Starter
Instructor
Joined: Jun 2015
Posts: 245
Likes: 10
From: Kansas City (Lees Summit) Missouri
Well update I reset the actuators and it was all working perfectly for a few days and then today the passenger side started blowing warm.
Reset actuators and no change. Then turned pass side temp dial to the middle and reset. Now it's blowing cold in all vents. The actuator by the stereo is constantly buzz buzz buzzing even while the system is on and blowing cold air. Is this acutator that controls the drivers side temp? And there's another actuator that controls the passenger side? Where is it? I want to start swapping in new actuators to see if that's the problem. My access to a backup HVAC unit is more limited.
Reset actuators and no change. Then turned pass side temp dial to the middle and reset. Now it's blowing cold in all vents. The actuator by the stereo is constantly buzz buzz buzzing even while the system is on and blowing cold air. Is this acutator that controls the drivers side temp? And there's another actuator that controls the passenger side? Where is it? I want to start swapping in new actuators to see if that's the problem. My access to a backup HVAC unit is more limited.
Le Mans Master
Joined: Feb 2012
Posts: 6,644
Likes: 479
From: OK
Drifting
Joined: Jun 2013
Posts: 1,965
Likes: 343
From: Shell Point (Crawfordville) Florida
Wow, kudos to you for your perseverance, research, mechanical skills, in finding the problem. Hopefully when you repair/replace those and get it all back together, it will all work well. Then you'll be complaining about freezing your *** off.
Nice job so far, can you think of anything else you want to do in there now that you have the whole dash apart? LED bulbs? New hazard switch just for the helluvit?
Nice job so far, can you think of anything else you want to do in there now that you have the whole dash apart? LED bulbs? New hazard switch just for the helluvit?