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Old 11-02-2017, 11:36 PM   #1
pithyapple
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Default Blower Motor and Resistor

Greetings Saturn Forum!

My blower motor quit working. The wiring to the motor is getting volts at all switch levels and appears to have continuity. The motor passes a bench test. (I also prematurely purchased a new motor that also does not work when plugged in, but also passes a bench test.)

I tracked down what I think is the ground (very hard to tell from any schematics I have located online, so I could be wrong - the ground I checked and cleaned (actually two) are the ground leads attached to the braces on either side of the center console). Both of those leads are fine. I cleaned them anyway to be sure, but the blower motor still does not work when plugged in.

I am thinking that the resistor may be the problem (please correct me if I am wrong!). I am having trouble finding anything that shows me how to locate and access the resistor, though. The one set of diagrams that I found online suggests that the resistor is under the windshield defroster duct (does that sound correct?), but also instructs me to disable to SIR system (airbags) first.

Is under the windshield defroster duct the correct location? (If so, how do I access that?)

Are the airbags really a concern for this operation?

Should I consider other potential issues besides the resistor?

- Cliff

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Old 11-02-2017, 11:59 PM   #2
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Default Re: Blower Motor and Resistor

Drive a Ferrari, Lamborghini, Ford pickup? Year and model may help. In general, high speed bypasses the resistor card mounted in the HVAC enclosure since heat from the resistor card at lower speeds are cooled by forced air flow. If high speed (direct connection to fused 12v) doesn't work, this is either the hot lead or ground wire on the motor, not a ground wire connected to the console chassis. Examine the blower motor wires and their connections as far as you can separate these two wires from wiring. You may find burned insulation and/or fried connections with melted terminals.

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Old 11-03-2017, 11:18 AM   #3
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Default Re: Blower Motor and Resistor

Shoot - I'm sorry. I originally had the year and model in my post, but the first post didn't take and I spaced it when O rewrote the post. Arg...

2000 Saturn SL2

I haven't been able to trace the wires very far, or find any schematic that shows where the wires go....

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Old 11-03-2017, 12:34 PM   #4
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Default Re: Blower Motor and Resistor

http://www.saturnfans.com/forums/sho...d.php?t=210656, post#8.

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Old 11-03-2017, 01:11 PM   #5
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Default Re: Blower Motor and Resistor

Here is the thumbnail:

http://www.saturnfans.com/forums/att...1&d=1442752489

EDIT: well, it cannot be viewed clearly even when Ctrl + is used.
Use Fdryer's link above to post 8 instead.

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Old 11-03-2017, 01:34 PM   #6
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Default Re: Blower Motor and Resistor

Quote:
Originally Posted by toggenburg View Post
Here is the thumbnail:

http://www.saturnfans.com/forums/att...1&d=1442752489

EDIT: well, it cannot be viewed clearly even when Ctrl + is used.
Use Fdryer's link above to post 8 instead.
Here you go.

For reference on how to grab an image from another post or photo link...open the linked photo > right click anywhere on the photo > select copy image address > go to post reply and select the insert photo icon > paste the link. The result will be like below.


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Last edited by trottida; 11-03-2017 at 01:39 PM..

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Old 11-03-2017, 02:31 PM   #7
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Default Re: Blower Motor and Resistor

Thank you for the schematic!

Now - is it possible to cure my ignorance via this thread? If I understand the schematic correctly, the ground wire from the blower motor runs directly to something called the "H-Brace Ground." - But by looking at the schematic, I have no idea where, specifically, in my vehicle that H-Brace Ground might be located. Can anyone provide any direction about that?

Also, should I be concerned with the other grounds referenced in the schematic?

(2000 Saturn SL2)

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Old 11-03-2017, 03:07 PM   #8
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Default Re: Blower Motor and Resistor

1-Follow both blower wires to wherever they go. One will be ground.

2-The H brace describes the center console sheet metal supports to hold up the inside panel running across the windshield and provide mounting space for the radio, HVAC control panel, etc..

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Old 11-03-2017, 04:47 PM   #9
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Default Re: Blower Motor and Resistor

http://www.saturnfans.com/forums/sho...d.php?t=179483

similar issue?

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Old 11-03-2017, 07:14 PM   #10
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Default Re: Blower Motor and Resistor

Right side of the center console, remove I/P Panel fuse door and it is right in front of you, about a 1/2" wide channel brace.

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Old 11-04-2017, 11:17 AM   #11
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Default Re: Blower Motor and Resistor

Ok, so if that is the H-Brace, then I did check and clean that ground wire. It was fine, and is now extra clean!

As soon as the rain stops, I'll have to take a look at that thread that alordofchaos sent. I read it when I first started on this adventure, but it didn't make any sense to me then. It is much clearer now that I've been playing around with this for a few days. I was actually looking at the wiring last night from the driver's side, wondering if I didn't have an issue with the wires going to the relay box, but everything seemed ok.

Also checked the relay connections from the passenger side and all good. Relay itself clears tests also.

Maybe I'll see something if I remove the wire bundle. Hopefully I can figure out what the F-2 pin is...

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