blower motor stopped working

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.

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?

How are you testing those wires?

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.

4 volt and 9 volt reading are coming from grey wire going to ac control module.

ac control module is located under dash on passengers side.

blower motor is on firewall on 98 deville

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.

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

What is acm code 1340, 98 deville, pcm 0603 pzm2477,b2477

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

What is code ACM 1340

reread the codes that is not a code

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.

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

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.

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

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?

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?

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.

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.

Did you check voltage reading at the fuse? If it does the same thing, have to backtrack the circuit.

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.?

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

And how do I access that? I'm thinking its behind the glove box.

Yes behind glove box

Any special tools or procedures to changing this

no regular tools

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

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

I have the hvac controller. Could you help with some steps to install?

Sorry been away what happened?

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..

Power the blower motor direct from the battery and see what happens

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.

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.

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

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.

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.

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