AC Woes
Thread Starter
Melting Slicks
Joined: May 2013
Posts: 2,934
Likes: 1,369
From: New Jersey
2025 Corvette of the Year Finalist - Unmodified
2024 C2 of the Year Winner - Unmodified
2024 C1 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Winner - Unmodified
St. Jude Donor '25
AC Woes
I have the typical AC issues in the 99 - warm on driver side, cool on passenger. When I first bought the car, I had these issues; checked the relays, grounds, fuses and without any direct correlation, the issue fixed itself and all was normal - cool air out of all vents.
Fast forward a few weeks to today, and I noticed that the issue has returned, I have B0361 H and B0441 H codes. When I go to reset the codes in DIC, I hear the HVAC "resetting" itself and maneuvering the blend doors, etc then the same H codes return (they don't show as C). After doing the HVAC code reset several times and starting the car, there is no change. What is also strange is that air is coming out of all vents and doesn't seem to change when I alter the HVAC mode.
Thoughts and comments are appreciated.
Fast forward a few weeks to today, and I noticed that the issue has returned, I have B0361 H and B0441 H codes. When I go to reset the codes in DIC, I hear the HVAC "resetting" itself and maneuvering the blend doors, etc then the same H codes return (they don't show as C). After doing the HVAC code reset several times and starting the car, there is no change. What is also strange is that air is coming out of all vents and doesn't seem to change when I alter the HVAC mode.
Thoughts and comments are appreciated.
Thread Starter
Melting Slicks
Joined: May 2013
Posts: 2,934
Likes: 1,369
From: New Jersey
2025 Corvette of the Year Finalist - Unmodified
2024 C2 of the Year Winner - Unmodified
2024 C1 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Winner - Unmodified
St. Jude Donor '25
Tried resetting the HVAC codes again but 0361 H and B0441 H keep coming back, with warm on left and cool on the right.
It's frustrating because this problem fixed itself before and now it's acting funny again. I will try to pull fuse #27 at some point today and see if that gets me anywhere.
It's frustrating because this problem fixed itself before and now it's acting funny again. I will try to pull fuse #27 at some point today and see if that gets me anywhere.
Thread Starter
Melting Slicks
Joined: May 2013
Posts: 2,934
Likes: 1,369
From: New Jersey
2025 Corvette of the Year Finalist - Unmodified
2024 C2 of the Year Winner - Unmodified
2024 C1 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Winner - Unmodified
St. Jude Donor '25
Ok, pulling fuse 27 and reseating seems to have made the driver side cooler, but air is still coming out of all vents - defrost is cool, driver facing is warm, and passenger is all cool. Just disconnected the negative battery terminal to see if a full computer reset will help.
Thread Starter
Melting Slicks
Joined: May 2013
Posts: 2,934
Likes: 1,369
From: New Jersey
2025 Corvette of the Year Finalist - Unmodified
2024 C2 of the Year Winner - Unmodified
2024 C1 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Winner - Unmodified
St. Jude Donor '25
Left the battery disconnected for a 1/2 hour and reconnected, still having the same issues. Also, when I go to change modes, the air flow isn't changing with most of it coming out of the front defrost on the cooler side. Codes are still B0361 H and B0441 H.
Any thoughts before I call the dealer?
Any thoughts before I call the dealer?
Thread Starter
Melting Slicks
Joined: May 2013
Posts: 2,934
Likes: 1,369
From: New Jersey
2025 Corvette of the Year Finalist - Unmodified
2024 C2 of the Year Winner - Unmodified
2024 C1 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Winner - Unmodified
St. Jude Donor '25
I made an appointment to drop the car off at the dealer next Monday, they will diagnose and advise.
Thread Starter
Melting Slicks
Joined: May 2013
Posts: 2,934
Likes: 1,369
From: New Jersey
2025 Corvette of the Year Finalist - Unmodified
2024 C2 of the Year Winner - Unmodified
2024 C1 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Winner - Unmodified
St. Jude Donor '25
New development - the air blowing out of all vents might be a vacuum issue as I have read here on other threads. Over the weekend, I had my car at the shop and the manifold was removed for the oil sender, exhaust, and gaskets. I am beginning to wonder if the vacuum line wasn't reconnected? Anyone?
Thread Starter
Melting Slicks
Joined: May 2013
Posts: 2,934
Likes: 1,369
From: New Jersey
2025 Corvette of the Year Finalist - Unmodified
2024 C2 of the Year Winner - Unmodified
2024 C1 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Winner - Unmodified
St. Jude Donor '25
I am going back to the shop this afternoon they will put it up on the lift and check for the vacuum leak.
Nobody wants to weigh in here? Tough crowd
Nobody wants to weigh in here? Tough crowd
Team Owner
Joined: Dec 1999
Posts: 174,312
Likes: 1,216
From: Here
Pilot of Beer Force 1
Tampa Regional Coordinator
CI 4-5-6-7-8 Veteran
Organizer St. Jude Fundraiser
I believe in the Beer Fairy
IIRC there is a vacuum hose that runs behind the battery that may be your issue
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
7 Bolt-On Upgrades From Extreme Online Store to Level Up Your C6 Corvette
Pouria Savadkouei
Thread Starter
Melting Slicks
Joined: May 2013
Posts: 2,934
Likes: 1,369
From: New Jersey
2025 Corvette of the Year Finalist - Unmodified
2024 C2 of the Year Winner - Unmodified
2024 C1 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Winner - Unmodified
St. Jude Donor '25
Race Director
Joined: Oct 2004
Posts: 12,793
Likes: 4,614
Ok, pulling fuse 27 and reseating seems to have made the driver side cooler, but air is still coming out of all vents - defrost is cool, driver facing is warm, and passenger is all cool. Just disconnected the negative battery terminal to see if a full computer reset will help.
Cruising
Joined: Apr 2022
Posts: 12
Likes: 0
From my experience, this sounds like an actuator issue. In my 1998, I had to replace the actuator (it is under the dash on my model) because the gear inside the actuator had broken.
The actuator is the manual gear that moves when you turn the temperature dial. If the temperature is hot on the passenger side and cold on the driver side even when you move the dial colder on the passenger side, the actuator being broken would explain it.
I tried the Fuse 27 pull (as noted above) and that is a good place to start. But if the driver side is cool, passenger side is hot, and you have dual climate control, the actuator could be the issue.
I can post or dm you the manual instructions if you would like them. Hopefully this helps.
The actuator is the manual gear that moves when you turn the temperature dial. If the temperature is hot on the passenger side and cold on the driver side even when you move the dial colder on the passenger side, the actuator being broken would explain it.
I tried the Fuse 27 pull (as noted above) and that is a good place to start. But if the driver side is cool, passenger side is hot, and you have dual climate control, the actuator could be the issue.
I can post or dm you the manual instructions if you would like them. Hopefully this helps.
Thread Starter
Melting Slicks
Joined: May 2013
Posts: 2,934
Likes: 1,369
From: New Jersey
2025 Corvette of the Year Finalist - Unmodified
2024 C2 of the Year Winner - Unmodified
2024 C1 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Winner - Unmodified
St. Jude Donor '25
The shop fixed the blower mode issue, it was a vacuum line, and they didn't charge to make the repair. I didn't push the envelope on the hot/cool air issue as I believe that's the actuator, which I might just take to the Chevy Dealership for the 2-year warranty.
Thread Starter
Melting Slicks
Joined: May 2013
Posts: 2,934
Likes: 1,369
From: New Jersey
2025 Corvette of the Year Finalist - Unmodified
2024 C2 of the Year Winner - Unmodified
2024 C1 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C5 of the Year Winner - Unmodified
St. Jude Donor '25
Just to close the loop on this, the vacuum line is still holding up. Hot/Cold issue is verified as the actuator, will address in a few months.