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Blower motor stopped working

Tiny
SHANET88
  • MEMBER
  • 2 POSTS
No, can't hear the motor at all, I just check the voltage and ground, giving me a reading that starts at 14 volts then drops to 0 and repeats that.
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did you check voltage reading at the fuse? If it does the same thing, have to backtrack the circuit.
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
NEPDABOSS1991
  • MEMBER
  • 10 POSTS
  • 1996 CADILLAC DEVILLE
  • 110,250 MILES
Blower motor not coming on at all. Ran test light. I have power at red wire with light grounded at (-) battery. I have power at black wire with light grounded at (+) battery. No power at gray wire with light grounded at (-) battery. I ran these test with car running hvac set at 75 degrees and had someone adjust fan speed as I was testing. Then ran test with vehicle off and got the same results. Previous owner replaced blower motor. Ive checked all fuses and I know theres not relay for the blower just and air conditioning and heating programmer. Should I replace blower motor again? Or should I replace programmer or dash panel switch?
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Replace HVAC controller it is standard to replce it when blower is replaced. Blower AMP draw goes up and damages controller. Blower speed controled via Gray wire from controler
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
NEPDABOSS1991
  • MEMBER
  • 10 POSTS
And how do I access that? I'm thinking its behind the glove box.
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Yes behind glove box
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
NEPDABOSS1991
  • MEMBER
  • 10 POSTS
Any special tools or procedures to changing this
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
No regular tools
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 1997 CADILLAC DEVILLE
  • 126,000 MILES
Heater fan does not work on any speed. One day it just didn't work. Plug going into the heater assembly has three wires. Red = 12V, Black = Ground, and Grey = 0 Volts. It appears that either the grey wire is broken or the heater and A/C programmer is bad. Does this sound right? Also where is the heater and A/C programmer located and how do I locate the grey wire at the programmer terminal (Is it still grey)?
Thank you for your help.
Bob
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
First, you need to verify the blower motor is good. 2 wires, one 12 volts, the other ground. Check this first.

There may be a lower voltage on the grey wire as the programmer does not always use 12 volts for signal returns

Roy
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-2
Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
NEPDABOSS1991
  • MEMBER
  • 10 POSTS
I have the hvac controller. Could you help with some steps to install?
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Sorry been away what happened?
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
97CADDY
  • MEMBER
  • 1 POST
  • 1997 CADILLAC DEVILLE
  • 145,000 MILES
Comfort fuse good. A/c compressor engages. Able to select temp range up and down but no blower motor fan can be felt even when display shows auto or manual low or high.
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Power the blower motor direct from the battery and see what happens
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
You can power it directly and nothing will happen. It relies on a digital speed signal from the A/C programmer, that comes in on the little gray wire. More than likely, you need a blower motor. Very seldom, in fact never, have I seen a failed programmer cause a lack of blower operation. Check that you do have power and ground at the blower, with a test light across the connectors large wires(red/black). If you have a light across that circuit, replace the blower motor.
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Try to direct wire the motor if no check the voltage to the motor if none. Youll need to remove the blower motor wire it goes to a module in the a/c case replace that blower module.
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-1
Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
BADBOYMARCUS
  • MEMBER
  • 71 POSTS
  • 1995 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 125,000 MILES
I replaced blower motor. For heater and a/c and was working fine. But now it doesn't turn on I tried it yesterday and it was working. Not working today what do you think it is? This morning not working at all
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
Possibly loose conector or the connection can go bad inside a connector.
If you have a mulit metter, make sure your getting 12 volts at the motor connection.
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
If the voltage and ground are at the motor. Youll need to remove it and bench test it from the battery. Its poss. The squirel cage isnt on right.
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
BADBOYMARCUS
  • MEMBER
  • 71 POSTS
I was moving the fuse relay back and forth and the blower motor came on. And was working for one day and ouit working. Try doing the same thing but it dont come on any more
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)

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