1998 Cadillac Deville blower motor

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?
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Tuesday, October 21st, 2014 AT 1:31 AM

10 Replies

Tiny
WRENCHTECH
  • EXPERT
The motor should have 2 wires going into it, one for power and one for ground.
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Tuesday, October 21st, 2014 AT 4:52 AM
Tiny
WRENCHTECH
  • EXPERT
What you are probably seeing is the wiring going into the control module which is built in. The motor wires are likely not visible and the module is likely bad meaning the whole motor has to be changed anyway.
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Tuesday, October 21st, 2014 AT 4:53 AM
Tiny
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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
  • EXPERT
How are you testing those wires and what are you expecting to find?
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Tuesday, October 21st, 2014 AT 2:05 PM
Tiny
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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
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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
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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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Blower motor is on firewall on 98 deville
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Wednesday, October 22nd, 2014 AT 1:18 AM
Tiny
WRENCHTECH
  • EXPERT
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
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I am not up on the codes but if I am getting correct readings from blower connector why is blower not spinning. After three new motors from ebay in the last month I would dought that motor is bad.I put a different ac control module in thinking it might be ac control module that was bad. Do you have reprogram ac control module.
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Wednesday, October 22nd, 2014 AT 5:24 PM

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