HVAC Blend doors
Thread Starter
7th Gear
Joined: Jul 2025
Posts: 7
Likes: 0
HVAC Blend doors
MY gf has a 02 c5 and is having issues with the ac almost like it is stuck in the middle of defrost, floor and dash . The HVAC controller was replaced w a new one , and the procedure for setting it up done. MY ? is, on the build sheet it has a code CJ2 on build sticker , when I look it up the HVAC blend door is 250 bucks. Is ther only 1 or is there 2 blend door modules?? Alldata says there is 2 , but I want to make sure. I am hoping I don't have to ripe the whole dash apart. Thanks Joe
Tech Contributor
Joined: Jan 2007
Posts: 19,472
Likes: 1,171
From: Dyer, IN
MY gf has a 02 c5 and is having issues with the ac almost like it is stuck in the middle of defrost, floor and dash . The HVAC controller was replaced w a new one , and the procedure for setting it up done. MY ? is, on the build sheet it has a code CJ2 on build sticker , when I look it up the HVAC blend door is 250 bucks. Is ther only 1 or is there 2 blend door modules?? Alldata says there is 2 , but I want to make sure. I am hoping I don't have to ripe the whole dash apart. Thanks Joe
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
You and I have the same question. BLEND DOORS control temperature. DAMPER DOORS control air flow at the different levels/modes.
If you cannot select what vents that the air comes out of, you have a damper door issue. If that's the case, VACUUM to the damper servo vacuum control module is suspect.
Thread Starter
7th Gear
Joined: Jul 2025
Posts: 7
Likes: 0
Tech Contributor
Joined: Jan 2007
Posts: 19,472
Likes: 1,171
From: Dyer, IN
You and I have the same question.BLEND DOORS control temperature. DAMPER DOORS control air flow at the different levels/modes.
If you cannot select what vents that the air comes out of, you have a damper door issue. If that's the case, VACUUM to the damper servo vacuum control module is suspect.
Safety Car
Joined: Mar 2017
Posts: 3,771
Likes: 940
From: Orlando Florida
Two viable paths:
Take the car to a local Corvette specialist. And it really needs to be a knowledgeable Corvette mechanic, not just a good mechanic, not just a trusted mechanic. The problem isn’t terribly complex or remotely above the comprehension of a good mechanic, it just takes more time and less parts swapping than the average shop applies. A mechanic already familiar with the (common) issue will know what to test and where.
Option 2 (best!): go through this thread, even though it’s old and many of the photos no longer appear. Truly educational:
https://www.corvetteforum.com/forums...with-pics.html
Take the car to a local Corvette specialist. And it really needs to be a knowledgeable Corvette mechanic, not just a good mechanic, not just a trusted mechanic. The problem isn’t terribly complex or remotely above the comprehension of a good mechanic, it just takes more time and less parts swapping than the average shop applies. A mechanic already familiar with the (common) issue will know what to test and where.
Option 2 (best!): go through this thread, even though it’s old and many of the photos no longer appear. Truly educational:
https://www.corvetteforum.com/forums...with-pics.html
Tech Contributor
Joined: Jan 2007
Posts: 19,472
Likes: 1,171
From: Dyer, IN
Two viable paths:
Take the car to a local Corvette specialist. And it really needs to be a knowledgeable Corvette mechanic, not just a good mechanic, not just a trusted mechanic. The problem isn’t terribly complex or remotely above the comprehension of a good mechanic, it just takes more time and less parts swapping than the average shop applies. A mechanic already familiar with the (common) issue will know what to test and where.
Option 2 (best!): go through this thread, even though it’s old and many of the photos no longer appear. Truly educational:
https://www.corvetteforum.com/forums...with-pics.html
Take the car to a local Corvette specialist. And it really needs to be a knowledgeable Corvette mechanic, not just a good mechanic, not just a trusted mechanic. The problem isn’t terribly complex or remotely above the comprehension of a good mechanic, it just takes more time and less parts swapping than the average shop applies. A mechanic already familiar with the (common) issue will know what to test and where.
Option 2 (best!): go through this thread, even though it’s old and many of the photos no longer appear. Truly educational:
https://www.corvetteforum.com/forums...with-pics.html
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,668
Two viable paths:
Take the car to a local Corvette specialist. And it really needs to be a knowledgeable Corvette mechanic, not just a good mechanic, not just a trusted mechanic. The problem isn’t terribly complex or remotely above the comprehension of a good mechanic, it just takes more time and less parts swapping than the average shop applies. A mechanic already familiar with the (common) issue will know what to test and where.
Option 2 (best!): go through this thread, even though it’s old and many of the photos no longer appear. Truly educational:
https://www.corvetteforum.com/forums...with-pics.html
Take the car to a local Corvette specialist. And it really needs to be a knowledgeable Corvette mechanic, not just a good mechanic, not just a trusted mechanic. The problem isn’t terribly complex or remotely above the comprehension of a good mechanic, it just takes more time and less parts swapping than the average shop applies. A mechanic already familiar with the (common) issue will know what to test and where.
Option 2 (best!): go through this thread, even though it’s old and many of the photos no longer appear. Truly educational:
https://www.corvetteforum.com/forums...with-pics.html
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski