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Old Jul 5, 2023 | 03:10 PM
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Default blower motor
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blower motor for AC not working anymore. fuse seems ok. anything else i should check before i buy a new one? 2012 GS coupe. TIA
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Old Jul 5, 2023 | 05:41 PM
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Why are you going to buy a new one before testing the old one ???…could be the module, a bad connection or the wiring…could also be the HVAC module itself…wiring below is for a 13 but should be the same as yours.


Last edited by C5 Diag; Jul 5, 2023 at 06:37 PM.
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Old Jul 6, 2023 | 07:40 AM
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ok, i will check that first. thanks!
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Old Jul 6, 2023 | 09:42 AM
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I assume to do a proper bench test you would need a PWM signal generator for the speed control?
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Old Jul 6, 2023 | 10:42 AM
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Originally Posted by PCMusicGuy
I assume to do a proper bench test you would need a PWM signal generator for the speed control?

As long as you have either an advanced DVOM that can read PWM in milliseconds or a scope it can be done without removing the motor...below pic is scope capture of a C5 I did a while back also with a PWM signal...power (blue), ground (red) and the PWM signal (green) were all checked.


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Old Jul 12, 2023 | 02:49 PM
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would simply applying a 12 volt source to the motor to see if it spins be proper to do? i have the motor out and did this and nothing. thanks
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Old Jul 12, 2023 | 02:50 PM
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If you applied 12 volts and a ground and the motor doesn’t work you’ll need a new one.
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Old Jul 12, 2023 | 02:54 PM
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Originally Posted by C5 Diag
If you applied 12 volts and a ground and the motor doesn’t work you’ll need a new one.
ok, thanks. is the resistor built into these newer model motors? i could not find a replacement one
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Old Jul 12, 2023 | 04:30 PM
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Originally Posted by woodvette03
ok, thanks. is the resistor built into these newer model motors? i could not find a replacement one
I looked at a 2013 and the blower “module” or resistor is part of the blower motor assembly…yours should be the same.


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Old Jul 17, 2023 | 02:05 PM
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got it fixed! bought a new AC delco unit from rockauto and all good now. thanks to everyone for the help.
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