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Defroster not working

Tiny
NALLS
  • MEMBER
  • 1991 CADILLAC FLEETWOOD 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
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Tuesday, January 22nd, 2019 AT 7:23 PM
Tiny
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No, I see the actuator moving for heat and air. And also a black round part behind a door
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Tuesday, January 22nd, 2019 AT 7:29 PM
Tiny
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OK, good chance the programmer is not commanding the door positions to change.

Roy
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Tuesday, January 22nd, 2019 AT 8:21 PM
Tiny
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So the programmer is going bad. Will disconnecting the battery to reboot help?
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Tuesday, January 22nd, 2019 AT 8:25 PM
Tiny
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No, there is no such thing as a reboot.

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

Roy
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Tuesday, January 22nd, 2019 AT 8:32 PM
Tiny
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  • 15 POSTS
So what is the name of the part I need to look for?
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Tuesday, January 22nd, 2019 AT 8:34 PM
Tiny
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Ac programmer. I showed you the part from rock auto

Roy
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Tuesday, January 22nd, 2019 AT 8:37 PM
Tiny
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My year doesn't call for a programmer. 91 cadillac brougham 5.7 engine
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Tuesday, January 22nd, 2019 AT 8:48 PM
Tiny
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My bad found it
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Tuesday, January 22nd, 2019 AT 8:53 PM
Tiny
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Yes, they changed that system in 93.

Roy
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Wednesday, January 23rd, 2019 AT 4:51 AM
Tiny
NALLS
  • MEMBER
  • 15 POSTS
I also noticed I'm pulling a code 132 and 141
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Wednesday, January 23rd, 2019 AT 5:02 AM
Tiny
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Where did you get those codes from?

Roy
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Wednesday, January 23rd, 2019 AT 5:04 AM
Tiny
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From my ecc
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Wednesday, January 23rd, 2019 AT 5:05 AM
Tiny
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Did they have a E or F in front of them?

Roy
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Wednesday, January 23rd, 2019 AT 5:22 AM
Tiny
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Neither just numbes
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Wednesday, January 23rd, 2019 AT 5:52 AM
Tiny
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Error I mean 140 and 132
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Wednesday, January 23rd, 2019 AT 5:54 AM
Tiny
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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
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Wednesday, January 23rd, 2019 AT 5:58 AM
Tiny
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My car don't read out like that
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Wednesday, January 23rd, 2019 AT 6:13 AM
Tiny
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Is this the control head in your car?

Roy
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Wednesday, January 23rd, 2019 AT 6:22 AM
Tiny
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Sure is
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Wednesday, January 23rd, 2019 AT 6:29 AM

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