SPONSORED LINKS

Defroster not working

Tiny
NALLS
  • MEMBER
  • 1991 CADILLAC BROUGHAM
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 200 MILES
Car blow heat from the vent but not from the floor board and defrost vent.
Tuesday, January 22nd, 2019 AT 5:37 PM

27 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening

The most common cause for this is the programmer for the AC. It is the box behind the glove box that has the rod coming out that moves the door for air flow.

Can you hear or see it moving when you command defrost and floor?

Roy
Images (Click to make bigger)
Thumb
Thumb
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
+1
Tuesday, January 22nd, 2019 AT 7:23 PM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
No, I see the actuator moving for heat and air. And also a black round part behind a door
Was this
answer
helpful?
Yes
No
Tuesday, January 22nd, 2019 AT 7:29 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
OK, good chance the programmer is not commanding the door positions to change.

Roy
Was this
answer
helpful?
Yes
No
+2
Tuesday, January 22nd, 2019 AT 8:21 PM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
So the programmer is going bad. Will disconnecting the battery to reboot help?
Was this
answer
helpful?
Yes
No
Tuesday, January 22nd, 2019 AT 8:25 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, there is no such thing as a reboot.

Removing the battery cable will have no effect on this issue.

Roy
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Tuesday, January 22nd, 2019 AT 8:32 PM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
So what is the name of the part I need to look for?
Was this
answer
helpful?
Yes
No
-1
Tuesday, January 22nd, 2019 AT 8:34 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Ac programmer. I showed you the part from rock auto

Roy
Was this
answer
helpful?
Yes
No
Tuesday, January 22nd, 2019 AT 8:37 PM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
My year doesn't call for a programmer. 91 cadillac brougham 5.7 engine
Was this
answer
helpful?
Yes
No
Tuesday, January 22nd, 2019 AT 8:48 PM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
My bad found it
Was this
answer
helpful?
Yes
No
Tuesday, January 22nd, 2019 AT 8:53 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, they changed that system in 93.

Roy
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 4:51 AM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
I also noticed I'm pulling a code 132 and 141
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 5:02 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Where did you get those codes from?

Roy
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 5:04 AM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
From my ecc
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 5:05 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did they have a E or F in front of them?

Roy
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 5:22 AM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
Neither just numbes
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 5:52 AM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
Error I mean 140 and 132
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 5:54 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
They are not codes.

When you hold the off and warmer buttons at the same time, it will go into diagnostic mode.

The codes with start with the letter E and then numbers. When that is completed it will list F and then numbers.

When that is complete then it will display 7.0.

Roy
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 5:58 AM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
My car don't read out like that
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 6:13 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Is this the control head in your car?

Roy
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 6:22 AM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
Sure is
Was this
answer
helpful?
Yes
No
Wednesday, January 23rd, 2019 AT 6:29 AM

Please login or register to post a reply.

Related Defroster Not Working Content

VIEW MORE

Sponsored links