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Blower motor stopped working

Tiny
PAUL5477
  • MEMBER
  • 1998 CADILLAC DEVILLE
  • 4.6L
  • V8
  • AUTOMATIC
  • 144,000 MILES
Blower motor stopped working. Plug that goes into blower motor has 3 wires which are getting proper voltage but motor won't spin.I have had 3 new blowers from ebay but none will run. Why?
Tuesday, October 21st, 2014 AT 1:31 AM

61 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
There is an INDVERT fuse 50 amp. that needs to be checked here is the blower motor wiring diagrams so you can see how the system works and a guide to help check the fuse.

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

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Tuesday, October 21st, 2014 AT 4:52 AM
Tiny
PAUL5477
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There are three wires in plug that goes to blower motor, red wire is hot, black wire is black, wire from control module is grey and controls speed to blower motor. All wires are sending proper voltage.I have tried 3 new blower motors and none will spin.I assume that it is not the motor. What else could it be?
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Tuesday, October 21st, 2014 AT 8:24 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
How are you testing those wires?
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Tuesday, October 21st, 2014 AT 2:05 PM
Tiny
PAUL5477
  • MEMBER
  • 7 POSTS
I used a test light and voltage meter. Test light showed strong red light for hot wire and strong green for ground and less strong for variable voltage coming fron third grey wire which goes to ac control module. Voltage shows 12 volts coming from red wire and 4 volts if blower speed on high and 9 volts if blower speed low. Test light is connected to battery.
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Wednesday, October 22nd, 2014 AT 1:11 AM
Tiny
PAUL5477
  • MEMBER
  • 7 POSTS
4 volt and 9 volt reading are coming from grey wire going to ac control module.
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Wednesday, October 22nd, 2014 AT 1:13 AM
Tiny
PAUL5477
  • MEMBER
  • 7 POSTS
Ac control module is located under dash on passengers side.
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Wednesday, October 22nd, 2014 AT 1:16 AM
Tiny
PAUL5477
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  • 7 POSTS
Blower motor is on firewall on 98 deville
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Wednesday, October 22nd, 2014 AT 1:18 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 POSTS
What you're describing sure sounds like either a bad blower motor or an error in testing.

Have you tried pulling codes from it?

Diagnostic Trouble Code (DTC) Displaying

The diagnostic trouble codes (DTCs) may be displayed by using either of the following diagnostic tools:

The scan tool
The on-board diagnostics

Perform the following steps in order to display the DTCs using the on-board diagnostic method:

Press one of the following combinations:

For digital IPC, press OFF and WARMER.
For analog IPC, press OFF and PASSENGER WARMER.

Press the LO (fan speed) button until ACM? Appears.
Press the HI (fan speed) button until ACM CODES? Appears.
Press the HI (fan speed) button until ACM DTC appears.
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Wednesday, October 22nd, 2014 AT 2:05 AM
Tiny
PAUL5477
  • MEMBER
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I looked at the INDVERT fuse and has was okay but the connector was burned so I cleaned it up and everything works! I love this site
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Wednesday, October 22nd, 2014 AT 5:24 PM
Tiny
JIM JOYCE
  • MEMBER
  • 2 POSTS
  • 1998 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 109,000 MILES
What is acm code 1340, 98 deville, pcm 0603 pzm2477, b2477
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Thursday, August 1st, 2019 AT 5:33 PM (Merged)
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Google obd11 codes for answer. Youll need to check your blower motor for power and ground with a test light. If no power run a power wire to it to see if it runs. To check if the motor is good. Gl
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Thursday, August 1st, 2019 AT 5:33 PM (Merged)
Tiny
JIM JOYCE
  • MEMBER
  • 2 POSTS
What is code ACM 1340
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Thursday, August 1st, 2019 AT 5:33 PM (Merged)
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Reread the codes that is not a code
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Thursday, August 1st, 2019 AT 5:33 PM (Merged)
Tiny
GALBACH
  • MEMBER
  • 1 POST
  • 1998 CADILLAC DEVILLE
  • V8
  • 2WD
  • AUTOMATIC
  • 172,000 MILES
Heater blower is not working. The mechanic working on it replaced the heater blower, but claims will still not blow after replacing. Is there some trick to it or is he missing something. I assume he checked and there was voltage leading to the blower, before he replaced it. Note: I am able to use the controls on the steering wheel and dash etc, moving the fan speed and so forth.
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
There are a couple possibilities.

Your old motor died, caused too much of a load going through the fan controller, and it burnt up as well.
If your shop only checked the motor by hooking power directly to it and it didn't do anything, they probably would not go through the trouble to see if power was going to the motor (and I would NOT have done it either)

Your old motor is fine and your guy incorrectly diagnosed the problem
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
FORREST HOWELL
  • MEMBER
  • 1 POST
  • 1999 CADILLAC DEVILLE
  • 60,000 MILES
The blower motor has a three pin connector, pin A is battery negative and pin C is 12v positive. Pin B is a control voltage from the HVAC Programmer. From reading the GM test process, it appears the control pin gets a variable DC voltage (from around 4 to 9 volts) to set the motor speed. Can I supply a simple DC signal to the control pin to spin the motor, maybe using 12v from the battery with a resistor? I want to avoid damaging the motor and it's control circuit in case it's not the problem.
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,256 POSTS
Hello,

Yes you can but you need to connect power to the right terminals. Here is a wiring diagram (below) and a guide that will help you:

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please let us know what happens.

Cheers, Ken
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
SHANET88
  • MEMBER
  • 2 POSTS
  • 1997 CADILLAC DEVILLE
  • 4.6L
  • V8
  • FWD
  • AUTOMATIC
  • 102,000 MILES
I had just bought the car in February a few months back. When I had purchased it the heater was working fine, and it was saying Freon was low, and a/c compressor turned off. A week or 2 later the fan stopped blowing air randomly, and sometimes it just wouldn't work at all. Today I decided to replace the blower motor thinking that was the issue. And it still isn't blowing any air at all out of the vents, I still haven't recharged the system yet due to it having possible leaks, and I want to get the air to blow before I charge the system. Any ideas what is causing this?
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Before you replaced the blower motor, you should have checked the blower motor connector for voltage and ground. Go from there.

You can't hear the new blower motor at all?
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)
Tiny
JDL
  • MECHANIC
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Note the diagram, red is voltage, hot all the time, use voltage tester. Black wire is ground, check ground. Gray wire is speed control, check voltage, dmm, voltage goes from hi to low.
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Thursday, August 1st, 2019 AT 5:34 PM (Merged)

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