The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-24-2020, 01:53 PM   #1
bimmerbit-93
Registered User
 
Join Date: May 2012
Location: Fort Collins, CO
Posts: 6
1994 Chevy Silverado, heater A/C controls work but panel is dark.

I have replaced the heater A/C controller about 3 years ago with a new one from Chevy. It has worked but occasionally the panel did not light up. Now it never lights up. I checked the brown wire and read wire that plugs into the unit. The red wire for battery is always hot, and the brown wire is hot when the switch is on. Again, not lights in the panel.
bimmerbit-93 is offline   Reply With Quote
Old 02-24-2020, 06:38 PM   #2
bimmerbit-93
Registered User
 
Join Date: May 2012
Location: Fort Collins, CO
Posts: 6
Re: 1994 Chevy Silverado, heater A/C controls work but panel is dark.

My heater a/c control works the system fine, but the display panel is totally blank. I just installed it new from GM about 3 years ago. The screen has always gone blank from time to time, but now it never shows anything. I have checked the wires coming to it and the read battery wire is hot all the time; the brown wire above it is hot when the switch is on. Does anyone have any ideas what to check next?
bimmerbit-93 is offline   Reply With Quote
Old 02-25-2020, 02:55 PM   #3
Second Series
Registered User
 
Second Series's Avatar
 
Join Date: May 2015
Location: Tukwila Washington
Posts: 371
Re: 1994 Chevy Silverado, heater A/C controls work but panel is dark.

Bad ground? Here's a video I found:
https://www.youtube.com/watch?v=0kD4-iJxPdo
__________________
'47 Panel to '88 K2500 Frame Swap
Mechanical Speedometer Drive Solution
1947.2 1 ton Chevy Panel
1955.2 Chevy 6700 Bus/RV
1990 Chevy K1500
Second Series is offline   Reply With Quote
Reply

Bookmarks

Tags
1994 silverado, heater a/c controller

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 05:23 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com