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 Write-Up: Blower Motor Control Module Replacement

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Abaddon
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Name : Scott
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Wed Feb 19, 2014 8:33 am

The only Head schematics I have are what I've posted for you, and one's for the Sunload sensors and passenger heater control. You should be able to diagnose your problem with what I've given you so far.
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J. Chris Davis
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Thu Feb 19, 2015 2:00 pm

Great write-up. Helped me figure out where this was and diagnose it as the problem. Took me about a half an hour to get changed out and now I have blowing heat again. Man was it cold last night and this morning with no heat blowing in the car.
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chitown_riv98
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Thu Feb 19, 2015 10:35 pm

J. Chris Davis wrote:
Great write-up. Helped me figure out where this was and diagnose it as the problem. Took me about a half an hour to get changed out and now I have blowing heat again. Man was it cold last night and this morning with no heat blowing in the car.

I went thru a winter in Chicago with no heat due to a blower module out in the riv. It really sucked. I had to scrape inside the car. That's what got me to rivperformance
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stan
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Fri Feb 20, 2015 12:06 am

...wow...in Chicago with no heat Ruben?......man.....
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chitown_riv98
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Fri Feb 20, 2015 11:13 am

Yep. I would get to work after an hour drive with hypothermia. I figured it out finally and got a new module at the dealer to install. Its a pain working under the dash to replace it. Thanks to this forum I figured out the problem
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Mon Mar 02, 2015 9:07 pm

My turn...
First start yesterday morning and I had no air; warm or cold. No signs of life from the fan motor.

Thanks, Scott, for the write up.
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AA
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Mon Mar 02, 2015 11:31 pm

If you can wait for it, try finding a used OEM part - mine was $30. These modules either go bad or last forever, it seems. If you buy from RockAuto: $130, GMparts Direct: $150, dealer: $290.

It's really easy to swap. Best of luck.

_________________
'98 SC Riviera 281k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
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charlieRobinson
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Mon Mar 02, 2015 11:57 pm

If I'm not getting any air or sounds at all, it's most likely the blower motor, right? And not the control module?

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AA
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Tue Mar 03, 2015 7:20 am

Difficult to say. Both can result in motor not working. I'd replace the module first, unless you can remove the motor and test it.

_________________
'98 SC Riviera 281k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO 85k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun


'70 Olds Ninety-Eight Holiday Coupe 116k miles 455 Rocket V8
Because cool


'95 Celica 152k miles 0-60: yes
Because free
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http://www.cardomain.com/ride/657082/4
Abaddon
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Tue Mar 03, 2015 8:36 am

charlieRobinson wrote:
If I'm not getting any air or sounds at all, it's most likely the blower motor, right? And not the control module?

Didn't I specifically tell you to put 12v to the Blower Motor? (not in this write-up) You can do it right in the car without removing it. I've used a Battery Jump Box with some jumper wires before....

Or better yet, get yourself a 194 marker light socket with a bulb. Unplug the blower motor. Put the wires of the light socket into the connector for the blower motor. Turn the heat on HIGH. The bulb should light up BRIGHT. The lower fan speed you go, the dimmer the bulb will get. This would tell you if the BMCM is functioning or not. Or you could use a Voltmeter. 12V being HIGH setting, roughly 6V being LOW, with an even "ramp" in between.
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AA
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Tue Mar 03, 2015 8:45 am

Good idea testing the motor with 12v. Then do the lamp test on the module to rule out wiring/fuse/climate control as issue. thumbsup

_________________
'98 SC Riviera 281k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO 85k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun


'70 Olds Ninety-Eight Holiday Coupe 116k miles 455 Rocket V8
Because cool


'95 Celica 152k miles 0-60: yes
Because free
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http://www.cardomain.com/ride/657082/4
charlieRobinson
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Name : Charlie
Age : 33
Location : Toledo, OH
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Sun Mar 08, 2015 12:05 am

I flew over to Psycho Sexy's hideout today.



Swapped out the BMCM from his parts Riv and sha-blam; air system is back online.
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MONTANARIV
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PostSubject: Re: Write-Up: Blower Motor Control Module Replacement   Sat Jun 02, 2018 12:23 pm

Hi all - my fan in my 97 just stopped working at any speed driving out of the parking lot. Checked fuses, all good. Guy at NAPA whose owned 3 (2 '95s and a '99) said its likely the blower motor or the resistor. He had the blower motor so figured I'd try that first. What a PITA it is taking the blower out without removing the module first! smile Ah well, live and learn. Ended up having to remove the module anyway as I couldn't unhook the wires from it to let the motor drop. And it turns out, its not the blower anyway. GM module on order from Rock Auto for $120. Thanks for all the writeups - just like to recommend that if anyone needs to replace the blower motor, pull the module first - will make life much easier - cheers!
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