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Old 11-21-2021, 10:11 AM   #1
Duner
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1998 SL1
Default 1998 SL with A/C blower motor

Wife says blower motor is making strange noises on cold day.
Anybody every add lube to theirs. Yesterday it was above freezing and no noise. Thanks.
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Old 11-21-2021, 11:45 AM   #2
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Default Re: 1998 SL with A/C blower motor

Frequently the bearings are 'bushings', not frictionless balls.

The bushings are oft made of 'sintered' brass/bronze which is
filled with lubricant, which eventually evaporates.
Very common for an old blower to holler\howl when started cold.

Eventually the shaft wears the bearing until the rotating member
contacts the fixed elements ... and rotation ceases.

If the issue is with the blower-end-bearing, it might be possible
to remove the plastic blower and drop light oil on the bearing,
and extend the service life. But it might be both bearings; either end
of motor shaft. And, the oil 'solution' might create a new problem --
an Odor of lubricant that is an irritant.
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Old 11-21-2021, 01:49 PM   #3
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Default Re: 1998 SL with A/C blower motor

Have you listened to the noise personally? There are possibilities for "strange noises" in there that are not caused by the blower motor/bearings...
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Old 11-21-2021, 06:13 PM   #4
Duner
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Default Re: 1998 SL with A/C blower motor

I have not heard the noise personally. Just going on what the wife says.
It will get below freezing in a few days.
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Old 11-30-2021, 07:20 PM   #5
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Default Re: 1998 SL with A/C blower motor

Took the car to town today and now I know what she is talking about.
About every 15 seconds with blower motor on low or high setting you get about a 2 seconds of EEERRRR from the blower motor side of car, if blower motor is at off position there is no sound. When blower is on high it is audible but not loud at all. On low it is real easy to hear. Any body ever run into this before?
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Old 11-30-2021, 08:16 PM   #6
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Default Re: 1998 SL with A/C blower motor

It is characteristic to hear different reports at different speeds...
The fan cage is not spinning true, but wobbling on the shaft,
which is loose in the worn bush.

As BillR notes, other things can be involved:

leaves get sucked into the fan cage

my '96S had a nice soft grass nest made by an enterprising field mouse!
...........

Not hard to inspect, IIRC... a few screws allow removal of the motor-fan
from the HVAC housing.
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Old 11-30-2021, 09:00 PM   #7
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Default Re: 1998 SL with A/C blower motor

As I recall, the blower motor/wheel come out fairly easily. You can look/feel up in there for debris that the wheel may be rubbing on. While the motor/wheel is out tin the open, turn it on to spin it up and see if that assembly, alone, is making the noise.
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Old 12-01-2021, 09:46 AM   #8
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Default Re: 1998 SL with A/C blower motor

Assuming nothing else breaks, swapping the blower motor is pretty quick and easy. Only hard part is fitting yourself into the passenger footwell.

Vid: https://www.youtube.com/watch?v=6mCopVB6Qt0
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Old 12-26-2021, 04:51 PM   #9
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Default Re: 1998 SL with A/C blower motor

Still making noise. Post # 5 describes the sound and how often.
I unplugged the motor at the motor but left fan switch on and still hear the noise even tho the fan motor is stopped. The noise is definitely coming from fan motor area. Any ideas?
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Old 12-26-2021, 09:52 PM   #10
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1995 SW2
Default Re: 1998 SL with A/C blower motor

Quote:
Originally Posted by Duner View Post
Still making noise. Post # 5 describes the sound and how often.
I unplugged the motor at the motor but left fan switch on and still hear the noise even tho the fan motor is stopped. The noise is definitely coming from fan motor area. Any ideas?
Push the recirculation button with the fan switch on and the fan motor unplugged. See if it makes the noise, or stops making it.

It is most likely your blend door actuator gear. These break and then the motor will keep running and hitting the broken teeth.

Fortunately they are about $20 or so and take about 1 hour to replace if you are limber enough.
...
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1998 Sl2 5spd: Family Car, Stock :135,000
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Old 12-27-2021, 09:38 AM   #11
Duner
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Default Re: 1998 SL with A/C blower motor

Thank you for quick reply. I will do what you say so far a testing.
Is this a dealer item or aftermarket?
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Old 12-27-2021, 06:12 PM   #12
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Default Re: 1998 SL with A/C blower motor

Fan motor disconnected it makes no difference if recirculate button is off/on . plus I tried five different settings for which way the air is directed windshield/feet etc and no difference. If I had to imagine what stripped teeth in the blend door actuator motor sounds like, the sound mine is making would be it.
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Old 12-29-2021, 11:28 PM   #13
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Default Re: 1998 SL with A/C blower motor

I can imagine that there is a relay, flasher, enunciator module in the fuse box that might be going bad or even loose in it's socket.

As far as the blower motor: it comes out much more easily than you think. Mine started vibrating badly on high speed. It ended up being a chunk of plastic bracket in the squirrel cage. Though I've heard of leaves and dirt being the cause of imbalance as well.

I removed the motor in less than 15 minutes, and installation took less than that because of newly gained familiarity. Admittedly, one needs to be somewhat of a contortionist. The back screw is hidden between the fan motor and the firewall and all three screws point straight upwards. It just takes 1/4" drive ratchet, extension, u-joint, and socket. I think it is 7mm.

While mine was out, I removed some plastic covers and the squirrel cage off the motor and lubed the bushings/bearings as best I could before reinstalling it.

My car is a '94, and it's still the original blower motor.

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Old 12-29-2021, 11:30 PM   #14
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Default Re: 1998 SL with A/C blower motor

Ooops. This was another duplicate post on my part.

I'm obviously doing something wrong, because I keep duplicating posts.

I don't know how NOT do it, nor how to delete the duplicate.

I'm sorry guys. I should know better.

Preston
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