HVAC Lights not working
06-13-2023, 10:55 PM
#1
Cruising
Thread Starter
HVAC Lights not working
Hi guys. So a bit of backstory. I just got my Vette and it’s actually been in my family since it was new. My uncle bought it and when he passed away my Grandfather took it and he always said he would will it to me. I’ve always been a HUGE car nut. Well my Grandfather is now 87 and getting in and out of it is a struggle so he told me to enjoy it. Needless to say the car is super important to me.
With that being said I’m trying to restore her to her former glory. I did the fix for the blank display and I thought all was well until the first time I drove it at night . Turns out the lights for the buttons aren’t working either. Any chance one of you gurus know how to fix the backlighting so they work as well as the display or have a walkthrough?
With that being said I’m trying to restore her to her former glory. I did the fix for the blank display and I thought all was well until the first time I drove it at night . Turns out the lights for the buttons aren’t working either. Any chance one of you gurus know how to fix the backlighting so they work as well as the display or have a walkthrough?
06-13-2023, 11:30 PM
#2
Racer
Got this from an old Bill Curlee post HTHYou might not need any bulbs. The HVAC units are notorious for lights going out due to poor soldering from the factory. If you are capable, first try re-soldering all bulbs, especially the burnt out ones. Dimming of the readouts was the result of poor connections due to the before mentioned lousy soldering. I had the problem myself. Eventually it looked like all the readouts went blank. Very simple to remove the HVAC unit and open it. Everything works perfectly after doing a complete re-solder. At this point you can replace all bulbs with LED's.
As weird as it seems, I would suspect that you have an IGNITION SWITCH issue. The contacts inside the switch part are burnt and do not allow proper voltage through the switch contacts for that circuit until the contacts get warm/hot..
Hers a post for you.. You can prove that this is the issue by using a meter and testing the voltage at the mini fuse test points on top of of the fuse. There are TWO small test points on all the fuses. Measure them to CHASSIS GROUND. They should read FULL battery voltage when the switch is ON.
Test the HVAC Fuse and see if it reads LOW when it doesn't work!
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
As weird as it seems, I would suspect that you have an IGNITION SWITCH issue. The contacts inside the switch part are burnt and do not allow proper voltage through the switch contacts for that circuit until the contacts get warm/hot..
Hers a post for you.. You can prove that this is the issue by using a meter and testing the voltage at the mini fuse test points on top of of the fuse. There are TWO small test points on all the fuses. Measure them to CHASSIS GROUND. They should read FULL battery voltage when the switch is ON.
Test the HVAC Fuse and see if it reads LOW when it doesn't work!
- C5 ignition Switch repair - http://forums.corvetteforum.com/c5-t...ch-repair.html
06-14-2023, 12:06 AM
#3
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06-14-2023, 12:52 AM
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06-17-2023, 06:36 PM
#6
Drifting
Hi guys. So a bit of backstory. I just got my Vette and it’s actually been in my family since it was new. My uncle bought it and when he passed away my Grandfather took it and he always said he would will it to me. I’ve always been a HUGE car nut. Well my Grandfather is now 87 and getting in and out of it is a struggle so he told me to enjoy it. Needless to say the car is super important to me.
Logged in as Ed Ramberger
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With that being said I’m trying to restore her to her former glory. I did the fix for the blank display and I thought all was well until the first time I drove it at night . Turns out the lights for the buttons aren’t working either. Any chance one of you gurus know how to fix the backlighting so they work as well as the display or have a walkthrough?
Logged in as Ed Ramberger
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With that being said I’m trying to restore her to her former glory. I did the fix for the blank display and I thought all was well until the first time I drove it at night . Turns out the lights for the buttons aren’t working either. Any chance one of you gurus know how to fix the backlighting so they work as well as the display or have a walkthrough?
