C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

Havc unit completely dead

Thread Tools
 
Search this Thread
 
Old Mar 13, 2022 | 11:33 PM
  #1  
1997 C5's Avatar
1997 C5
Thread Starter
Pro
 
Joined: Dec 2017
Posts: 572
Likes: 28
From: Volo, Illinois
Default Havc unit completely dead

My HVAC control unit is completely dead, the screen is completely blank and none of the function buttons work. So upon searching threads for same issues came across one thread in this forum dates back 12 years ago owner had 97 had same problem as I. He replaced ignition switch that fixed his problem.
my question is since there's no new ignition switch I will have to get a used one. Are 97-04 ignition switches same or is there cut off year ignition switches only work?

when I replace ignition switch with the used one, will my current key work with the used ignition switch?
I think my key vat is 7 or 8. I will have to check I wrote this FCC own when I got a spare key made 3 years ago.
Thanks for guidance in advance.
Reply
Old Mar 14, 2022 | 07:05 AM
  #2  
C5 Diag's Avatar
C5 Diag
Moderator, Tech Contributor
Supporting Lifetime Gold
10 Year Member
Veteran: Air Force
Liked
Community Favorite
 
Joined: Sep 2013
Posts: 15,360
Likes: 3,941
From: Cape Coral, Florida
Default

I explained in an earlier post what to check for your no comm…this doesn’t look like an ignition switch issue…also you do not need a new key…the ignition lock cylinder is removed from the old switch and installed in the new one…because someone’s switch fixed their issue doesn’t always mean it’s going to work for you !!…Rock Auto sells switches…don’t know why you say there are no new switches !!

Last edited by C5 Diag; Mar 14, 2022 at 07:36 AM.
Reply
Old Mar 14, 2022 | 10:40 AM
  #3  
vetteLT193's Avatar
vetteLT193
Melting Slicks
Supporting Lifetime
20 Year Member
Liked
Top Answer: 1
Top Answer: 3
 
Joined: Jul 2002
Posts: 2,221
Likes: 554
From: Tallahassee fl
Default

I think you are jumping to conclusions. There are a lot more items to check off before going the route you are heading. Fuses, the control panel itself is notorious for frying out, etc.
Reply
Old Mar 15, 2022 | 07:36 PM
  #4  
1997 C5's Avatar
1997 C5
Thread Starter
Pro
 
Joined: Dec 2017
Posts: 572
Likes: 28
From: Volo, Illinois
Default

Originally Posted by vetteLT193
I think you are jumping to conclusions. There are a lot more items to check off before going the route you are heading. Fuses, the control panel itself is notorious for frying out, etc.
I checked the fuses in the floor board on the passenger side. I think it was number 27. Can't recall exact fuse number.
Reply

Get notified of new replies

To Havc unit completely dead





All times are GMT -4. The time now is 12:28 AM.

story-0
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-1
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-2
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE
story-3
2027 Corvette vs The World: Every C8 vs Its Closest Competitor

Slideshow: 2027 Corvette lineup vs the world.

By Joe Kucinski | 2026-04-24 16:12:42


VIEW MORE
story-4
10 Most Common Corvette Problems of the Last 20 Years!

Slideshow: 10 major Corvette problems from the last 20 years.

By Joe Kucinski | 2026-04-14 16:37:05


VIEW MORE
story-5
5 MOST and 5 LEAST Popular Corvette Model Years in History!

Slideshow: 5 most and least popular Corvette model years.

By Joe Kucinski | 2026-04-08 13:25:01


VIEW MORE
story-6
2027 Corvette Buyer's Guide: Everything You Need to Know!

Slideshow: 2027 Corvette buyer's guide

By Joe Kucinski | 2026-04-17 16:41:08


VIEW MORE
story-7
10 Things C8 Corvette Owners Hate (But Won't Tell You)

Slideshow: 10 things C8 Corvette owners hate, but won't tell you.

By Joe Kucinski | 2026-04-01 18:36:07


VIEW MORE
story-8
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!

Slideshow: Should you add one of these incredible Corvettes to your garage?

By Brett Foote | 2026-04-01 18:14:05


VIEW MORE
story-9
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)

Slideshow: Every Corvette Grand Sport explained

By Joe Kucinski | 2026-03-26 07:13:44


VIEW MORE