SPONSORED LINKS

Heater display fail

Tiny
SCOTTSCOTT07
  • MEMBER
  • 1993 CHEVROLET TRUCK
  • 5.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 220,000 MILES
The other day I was driving around when I went to switch my heater from defrost to feet and body then switch it to high and as soon as I hit the high button the whole display shut off. I have checked the fuse and that is okay, but I was told by a friend it might be a control box kind of deal that went out. I am just trying to find somebody that has had this problem and knows the fix.


Additional information:

The heater has always seemed weak in low and medium setting I have not owned this truck long so this is my first winter with it.

I have also tried disconnecting the battery to try to reset the controller still no power to the unit.
SPONSORED LINKS
Saturday, January 7th, 2017 AT 12:44 PM

10 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Check instrument panel fuse. Do the dash lights operate?
Was this
answer
helpful?
Yes
No
-1
Saturday, January 7th, 2017 AT 1:04 PM
Tiny
SCOTTSCOTT07
  • MEMBER
  • 21 POSTS
Yes, lights work and fuse is good.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Saturday, January 7th, 2017 AT 1:42 PM
Tiny
SCOTTSCOTT07
  • MEMBER
  • 21 POSTS
I found something I did not see before. The fuses in my instrument panel are not all the right sizes. I have a thirty in the heater/air conditioner spot instead of a twenty five and others are the same, I am going to get those corrected now.
Was this
answer
helpful?
Yes
No
Saturday, January 7th, 2017 AT 1:56 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hey so did fuses work?
Was this
answer
helpful?
Yes
No
Sunday, January 8th, 2017 AT 11:42 AM
Tiny
SCOTTSCOTT07
  • MEMBER
  • 21 POSTS
No still no display on the heater unit
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, January 9th, 2017 AT 2:14 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Do you have a DVOM? Can you remove control head and do some voltage tests. I can help through it
Was this
answer
helpful?
Yes
No
Monday, January 9th, 2017 AT 2:18 PM
Tiny
SCOTTSCOTT07
  • MEMBER
  • 21 POSTS
I can get one and that was my next step just waiting to hear back from him I'll let u know when I have it
Was this
answer
helpful?
Yes
No
Monday, January 9th, 2017 AT 2:25 PM
Tiny
SCOTTSCOTT07
  • MEMBER
  • 21 POSTS
I've got the meter and control disconnected
Was this
answer
helpful?
Yes
No
Monday, January 9th, 2017 AT 4:13 PM
Tiny
SCOTTSCOTT07
  • MEMBER
  • 21 POSTS
The 3 on the top left and the top and bottom far right are hot
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Monday, January 9th, 2017 AT 4:27 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Then it is not an electrical issue so looks like control module is faulty
Was this
answer
helpful?
Yes
No
Monday, January 9th, 2017 AT 5:03 PM

Please login or register to post a reply.

Related Heater Switch Content

VIEW MORE

Sponsored links