HVAC issue
Thread Starter
4th Gear
Joined: Oct 2025
Posts: 4
Likes: 0
HVAC issue
I just bought my first Vette, 98. Love it so far but 2 things. Air is coming out all the vents. It will not change with the controls. Temperature changes fine it’s just the location changing issue. Where should I start with this issue? 2nd issue is a stick/gooey steering wheel airbag cover. Not sure what happened with it lol.
Pro
Joined: Dec 2014
Posts: 681
Likes: 275
From: Cincinnati Ohio
The modes are switched by vacuum and the vacuum source is at the back of the intake manifold. There are many threads on the vacuum line that goes through the firewall broken. There are also threads where the vacuum is good through the firewall but one of the solenoids that controls the mode switching is bad.
Thread Starter
4th Gear
Joined: Oct 2025
Posts: 4
Likes: 0
The modes are switched by vacuum and the vacuum source is at the back of the intake manifold. There are many threads on the vacuum line that goes through the firewall broken. There are also threads where the vacuum is good through the firewall but one of the solenoids that controls the mode switching is bad.
Thanks for the info! I’ll do a search with what you have told me
Safety Car
Joined: Mar 2017
Posts: 3,762
Likes: 937
From: Orlando Florida
In the stickies at the top of this forum is one called “Ultimate DIY Thread” which you will want to peruse many times in the days ahead. One of the many handy links to resolutions of common problems is exactly what you’re looking for:
https://www.corvetteforum.com/forums...with-pics.html
https://www.corvetteforum.com/forums...with-pics.html
Tech Contributor
Joined: Jan 2007
Posts: 19,360
Likes: 1,127
From: Dyer, IN
Provided there has been no recent maintenance requiring the removal of the intake manifold, the most likely cause is battery acid damage.
https://www.corvetteforum.com/forums...tery-acid.html
https://www.corvetteforum.com/forums...tery-acid.html
