A/C heat control not working properly

Tiny
SCOTTWARDRIP
  • MEMBER
  • 1998 CHEVROLET TRUCK
  • 4.3L
  • V6
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
No power to control panel.
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Tuesday, September 29th, 2020 AT 8:22 PM

18 Replies

Tiny
DL AUTOSHOP
  • MEMBER
Hello, I'm Danny.

First let's start by checking the fuse. Here is a tutorial show how to check fuses:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

You didn't specify what truck you have like S-series or Full-size as they both are offered the 4.3 L engine. I've attached below the location of the door jamb fuse box. Let us know and we'll go from there. Hope this helps and thanks for using 2CarPros.
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Wednesday, September 30th, 2020 AT 10:06 AM
Tiny
MONSTER79
  • MEMBER
  • 1995 CHEVROLET TRUCK
  • 5.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 204,000 MILES
I bought a new control panel because we thought that was the problem. Installed it and nothing works or makes noises. The two wires are getting juice no blown fuses.
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
HMAC300
  • EXPERT
If you have the old panel put that back in as the new one has to be programmed to your truck. Check to see if your temperature actuator is getting power or not. See pictures. Also, pull fuse with arrow for sixty seconds with key on. It may reset and give you heat. Finally if actuator is bad do not plug it in until it is installed as it may not work and you will have to do a reset again.
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
MONSTER79
  • MEMBER
Where is that fuse located?
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
HMAC300
  • EXPERT
Look at the picture carefully it tells you what box it is in, the one inside the truck.
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
MONSTER79
  • MEMBER
Do you have to remove the dash to get to it?
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
HMAC300
  • EXPERT
It is behind a cover to the left of the steering column. If you cannot find it have a local mechanic or auto parts look for it.
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
MONSTER79
  • MEMBER
Underneath the dash or do you remove the gauge cluster?
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
HMAC300
  • EXPERT
Please re read my last reply. It has a cover that has to be taken off or go to a mechanic so they can show you. We have no pictures of this otherwise I would have sent it.
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
MONSTER79
  • MEMBER
I found something yesterday. I used a light tester and tested the two wire plugins. One plug in would light up like a dream, the other one would not show hardly any light.
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
MONSTER79
  • MEMBER
I also found that the actuators are not getting power
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
HMAC300
  • EXPERT
Hopefully you tested the fuse with the key on. Now do as I said in the one reply to pull fuse for htr/ac for 60 seconds with key on then reinstall car can be running if you like it doesn't matter. Then see if you get heat if not then a mechanic has to scan for codes to see if it is the control head. I am assuming you put the old control back in if not the new one will need to be programmed to your vehicle to get power to actuator.
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
MONSTER79
  • MEMBER
Is this were the fuse is.
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
HMAC300
  • EXPERT
Yes if we had a picture I would have shown it long ago it's a 25 amp fuse.
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Thursday, January 14th, 2021 AT 8:30 AM (Merged)
Tiny
MONSTER79
  • MEMBER
What does it mean when the one wire set is not getting enough juice?
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Thursday, January 14th, 2021 AT 8:31 AM (Merged)
Tiny
HMAC300
  • EXPERT
One wire is getting juice and other is a ground so will not have any juice from your description the actuator is bad
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Thursday, January 14th, 2021 AT 8:31 AM (Merged)
Tiny
MONSTER79
  • MEMBER
What one would it be for the actuator?
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Thursday, January 14th, 2021 AT 8:31 AM (Merged)
Tiny
HMAC300
  • EXPERT
I've sent that info to you previously these pics should show you everything you need if not see a mechanic
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Thursday, January 14th, 2021 AT 8:31 AM (Merged)

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