1995 Cadillac Deville Blower motor

Tiny
BOB G
  • MEMBER
  • 1995 CADILLAC DEVILLE
Heater problem
1995 Cadillac Deville V8 Front Wheel Drive Automatic

I removed my Blower motor, it takes a 3 prong plug, the red wire going to the blower, has power, so I now have the blower on the bench. My question, is there a way to bench test this unit. I tried a hot to the terminal the red wire came off of, & a ground to the black, the motor does not spin. If I reverse the wires, the motor makes an attempt, but seems like its binding up. The motor spins freely by hand. Do I need to connect the middle terminal also to get it to spin? I just want to make sure it's the blower, before I purchase a new one. Any help would be appreciated. My aldata manual, only shows how to test with some type of scanner, which I don't have. Thank you. My email address is bobbyg83@ comcast. Net
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Saturday, December 27th, 2008 AT 2:28 PM

8 Replies

Tiny
DOCFIXIT
  • EXPERT
Hi Bob G
Yes a scanner is needed but you can check for trouble codes Key on press OFF and WARM hold till segment displayed. Use LO Fan to change between tests go to IPC then press HI codes will display record then post so I can advise. Press AUTO to exit.
Your blower motor is solid state and you can't get a reliable test hooking up wires in fact you can smoke a good motor.
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Saturday, December 27th, 2008 AT 2:54 PM
Tiny
BOB G
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I don't believe that info from Docfixit will help now. As I stated I removed the blower already, so I disconnected the negative battery, that will erase any codes correct. There must be a way to check the blower while it's on the bench? Are you telling there is absolutely no way to check it this way?
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Saturday, December 27th, 2008 AT 3:24 PM
Tiny
BOB G
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One other thing I forgot to mention, before I removed the blower, I did that test with the on board diagnosis, don't know if I had to go further with it, anyway I didn't, but this is the results I got.
PO98 Histiry
1039 current speed sensitive steering signal fault
1052 History keep memory alive
No ACP codes
No SIR codes
No TCS codes
Is this of any help, cause like I said I diconected the battery, so I'm sure it's all lost now.
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Saturday, December 27th, 2008 AT 3:44 PM
Tiny
DOCFIXIT
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Try this power to terminal C red wire, ground term A black wire then touch term B gray/black wire with a wire to ground if motor spins it's good.
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Sunday, December 28th, 2008 AT 8:56 AM
Tiny
BOB G
  • MEMBER
Thanks Doc, I've already tried that, ( no spin). Today I tried just laying the blower on the top of the engine, with the fan blades facing up. I then installed the 3 pin plug from the vehicles harness, hook the battery back up & turned on the blower swirch, (on Hi) with no results. I then took a test light grounded the pigtail wire & probed the red wire, (note the harness plug is still hooked up to the blower)I had power. I then back probed the gray & black wire with the test light, the motor gave itself a small spin then stopped.
Now from what you just told me, when I had the hot to the red & the ground to the black, then grounded the gray & black, it should spin, right. So if I'm reading you correctly, the motor is NG, correct. I appreciate your help, & thank you so much.
Bob G
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Sunday, December 28th, 2008 AT 7:11 PM
Tiny
DOCFIXIT
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Correct back probing gry/blk is last step in flow chart before replace motor. Had motor ran then APC is faulty.
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Monday, December 29th, 2008 AT 7:22 AM
Tiny
BOB G
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Thanks Doc, I was afraid it might be the programer, but what gave me doubt was, the programer was moving the mix rod for the duct & I was assuming the rest of it was ok. I guess I'll pick up a blower motor. One other question I have (if you don't mind) I had to remove the front engine mount & lower the engine to get the blower out, after removing it, I noticed I could remove the 3 small bolts in the black plate & pull the plate & the cover under this plate off. It now looks like, if I had done that there woul have been enough clerance to remove the blower without disturbing the front mount. My question is, is this correct. I'll get back to you after I replace the blower. I hope that takes care of my problem, this has been a nightmare for me, as I'm doing this job as a favor for a friend of my wife. Seems every time I do someone a favor, I run into the biggest problems & tie up more of my time than expected.
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Monday, December 29th, 2008 AT 8:58 AM
Tiny
BOB G
  • MEMBER
Hey Doc,
I just purchased a used blower motor on Ebay, got it today, checked it out, just as you advised, spins like a top. Installed it and it works great, thanks for the help, guess I'm never too old to learn a new trick, again thanks.
Bob G
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Friday, January 2nd, 2009 AT 7:13 PM

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