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Discussion Starter #21
Re: Weird intermittent humming noise...

AA/78U said:
bloc

what is the outdoor adventure package as listed in your signature?
Running boards, roof rack cross rails, and a rubber cargo mat. Not a package that I was looking for, but came with the holdover they found for me. I'm glad I have it, though.
 

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Discussion Starter #22
**Update** Weird intermittent humming noise...

So, I think I have it narrowed down to the parking brake. I was opening my door when I got home tonight, and when that motion rocked the car, I heard a squeak coming from the left rear well. I got out and pushed on the car to rock it back and forth, and it continued to make the noise. However, it does not make the noise when I have the parking brake set. Even if it's just one click down on the pedal. I can still rock the car with the brake set as I could without it set.

Could something be sticking in there? Could it come and go? Are the parking brakes only on the rear, and are they a separate brake? Want to get some info before I decide to take the tire off.
 

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Re: **Update** Weird intermittent humming noise...

Parking brakes only in the rear, should not be seperate brake but a cable running to the caliper, it could stick but you won't be able to tell until you pull the wheel. Sounds like a warped rotor, with the brake set the caliper cannot move as much and the squeak goes away.
 

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Re: **Update** Weird intermittent humming noise...

lsuduke said:
Parking brakes only in the rear, should not be seperate break but a cable running to the caliper, it could stick but you won't be able to tell until you pull the wheel. Sounds like a warped rotor, with the brake set the caliper cannot move as much and the squeak goes away.
Probably not. The parts manual lists parking brake shoes. On some vehicles now they have "shoes" that work inside the back of the rotor to enable the parking brake, kind of like the old drum brake concept.
 

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Re: **Update** Weird intermittent humming noise...

Thanks for the correction, haven't had a look at them , haven't gotten my service manual yet
 

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Re: **Update** Weird intermittent humming noise...

lsuduke said:
Thanks for the correction, haven't had a look at them , haven't gotten my service manual yet
Yes, parking brake shoes contact the inside of the rear brake disc when engaged via cables. If the cable is hanging up, due to lack of use, the shoes could be dragging on the inside of the drum. Rubbing the brake disc could cause the humming noise.
 

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Discussion Starter #27
Re: **Update** Weird intermittent humming noise...

XRDreamliner said:
Yes, parking brake shoes contact the inside of the rear brake disc when engaged via cables. If the cable is hanging up, due to lack of use, the shoes could be dragging on the inside of the drum. Rubbing the brake disc could cause the humming noise.
This makes sense, although when I slightly engaged the parking brake while moving, the humming noise did not go away.

How would I loosen up the cable?
 

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Re: **Update** Weird intermittent humming noise...

bloc0102 said:
This makes sense, although when I slightly engaged the parking brake while moving, the humming noise did not go away.
Hmmm... then I wouldn't adjust the parking brake if the noise didn't subside... this is one of those :banghead: problems.
 

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Discussion Starter #29
Re: **Update** Weird intermittent humming noise...

Okay, so I finally was able to get it down to my dad's shop so my brother could take a good look at everything. Popped the left rear wheel off and could notice that something was dragging a little bit. Not enough to be overly concerned with, though. Tried taking the heat shield off to get a look in the rotor, but could not get the nuts off even with a 400 ft lb impact... So, we knocked the rotor with a hammer, and holy cow did a lot of rust fall out. Sprayed everything down with brake cleaner and hopefully that'll help solve the problem!

Just to clarify, the parking break is inside the rotor and not part of the brake pad assembly, correct?

When turning the axle back and forth, we could hear the squeak I was talking about in an earlier post, and it sounds like it's coming from the drive axle just forward of the transfer case. Reason to be concerned?
 

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Re: **Update** Weird intermittent humming noise...

bloc0102 said:
Just to clarify, the parking break is inside the rotor and not part of the brake pad assembly, correct?

When turning the axle back and forth, we could hear the squeak I was talking about in an earlier post, and it sounds like it's coming from the drive axle just forward of the transfer case. Reason to be concerned?
Yes, the parking brake shoes are inside the rear brake rotor.

Well. a squeak coming from the drive-line assembly is not a good sign. According to the service manual, the unit contains the AWD clutch assy, including bearings, and the the drive-line assembly is not a serviceable item. If you haven't already, it may be worthwhile to have the rear differential fluid changed, just to see if a fluid change effects anything. Otherwise, I would suggest you take it to the dealer, raise it on the lift, and have them verify the squeak noise. This part should be covered under the 5 yr/100k powertrain warranty.
 

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Discussion Starter #31
Re: **Update** Weird intermittent humming noise...

Well, that didn't help, noise came back today. I'm leaning more and more towards a wheel bearing, or it having something to do with that squeak in the driveshaft. If I take it in, and they find out it's not covered by the powertrain warranty, do they charge me for the diagnosis?
 

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Re: **Update** Weird intermittent humming noise...

bloc0102 said:
If I take it in, and they find out it's not covered by the powertrain warranty, do they charge me for the diagnosis?
Depends on the dealer, but I would expect them to
 

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Re: **Update** Weird intermittent humming noise...

Bloc0102,

I was reading through the thread about your hum that you are experiencing. Do you have any new information to share with us about your situation?

I would have to agree with AA/78U about the diagnostic fee. I know around my area, there are dealerships that will charge the diagnostic fee, but take the amount that they charge for the diagnosis and put it towards the parts and labor of the repair work.

Sincerely,
Michelle P., GM Customer Service
 

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Discussion Starter #34
Re: **Update** Weird intermittent humming noise...

Thanks for your post Michelle,

No new information other than it happens quicker into my trips now that it is warmer out (5 miles instead of 10). So, it seems that some part has to be warm enough to cause it, but then when it gets hot, it stops. I think I'll stop by the dealership some day and show them the squeak when the car is rocked back and forth and see if they have any ideas or would be willing to look into it.

To be honest, I'm thinking about trading it off for the new Dodge Durango...



GM Customer Service said:
Bloc0102,

I was reading through the thread about your hum that you are experiencing. Do you have any new information to share with us about your situation?

I would have to agree with AA/78U about the diagnostic fee. I know around my area, there are dealerships that will charge the diagnostic fee, but take the amount that they charge for the diagnosis and put it towards the parts and labor of the repair work.

Sincerely,
Michelle P., GM Customer Service
 

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Re: **Update** Weird intermittent humming noise...

Bloc0102,

Thank you for the update. I would also recommend that when and if you take your Outlook in to the dealership, to request that they go for a ride with you so that you can point it out to them. I have read and found that it helps the service personnel know exactly what you, the consumer, is talking about.

Sincerely,
Michelle P., GM Customer Service
 

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Discussion Starter #36
Re: **Update** Weird intermittent humming noise...

GM Customer Service said:
Bloc0102,

Thank you for the update. I would also recommend that when and if you take your Outlook in to the dealership, to request that they go for a ride with you so that you can point it out to them. I have read and found that it helps the service personnel know exactly what you, the consumer, is talking about.

Sincerely,
Michelle P., GM Customer Service
That could prove difficult since once the car gets hot, the noise goes away. So, once I got it to the dealership, the noise will have subsided. I'd have to leave it at the dealership to cool down, and I can't be without a car for a day...
 

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Re: **Update** Weird intermittent humming noise...

Bloc0102,

Thank you for the additional information about your situation. You are correct, that can prove to be difficult and frustrating. However, there is always the avenue of talking with the dealership about getting a loaner so that you can get proper diagnostics of what you are experiencing with your 2008 Saturn Outlook.

Sincerely,
Michelle P., GM Customer Service
 

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Discussion Starter #38
Re: **Update** Weird intermittent humming noise...

Okay, so this issue took a little turn for the worse now. The noise was the worst it's ever been on my 8 mile drive home yesterday. When I got home and got out, I could immediately smell burning brakes, and there was a TON of heat coming out of that left rear wheel. Went and felt the fronts, and could hardly feel any heat. After it cooled down some, it seemed that there was more heat coming from the disc part of the rotor than the drum. So, I'm now wondering if it has something to do with my calipers or brake pads. Or if it has to do with those two nuts holding the calipers on that we couldn't get off with the impact wrench. Maybe they were over-torqued at the factory and that twisted something in there and they're not releasing fully? I want the dealer to check the torque on them; my brother thought they should only be torqued to 80 ft lbs and the 500 ft lb impact didn't get them off... Anybody have a good idea of what they should be torqued to? They're on the back side of the rotor and hold on the brake assembly.

Drove to work this morning, no noise and no heat. Taking it to the dealer on Monday. They said they'd take a look at it and work with me under warranty as long as it's not a regular brake issue since I'm only at 39k. If it's some sort of normal wear, I'd have the option to fix it or not, it didn't sound like they'd charge me anything. However, if it is something I'd want to fix it myself, I still can't get those nuts off!
 

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Re: **Update** Weird intermittent humming noise...

Bloc0102,

Thank you for the update about your Outlook. I was glad to read that you have contacted your dealership and they will take care of this under warranty if it proves to be something that is not normal wear and tear. Please, keep me informed of your visit.

Here is an idea for you; when you take it in on Monday talk with the techs about the nuts that you cannot get off. They could possibly assist you with that or tell you what you could use to get them off. I know that there is a spray that can help get stubborn nuts and bolts to break free, but I can’t remember the name of it. Sorry! Just remember I am not a tech, but I thought that it would be worth a shot! LOL

Have a great weekend!
Michelle P., GM Customer Service
 

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Discussion Starter #40
Took it in to the dealer today. Turns out one of the brake pads is stuck in it's slide against the rotor. They're blaming corrosion. Have about 5% of the outer pad remaining, inside is 95%. We should have noticed that when we had the wheel off 3 weeks ago; I think a lot of that wear has been done lately since it has gotten worse.

They think my caliper and pistons and everything are fine and my rotor can be turned. $279 for pads and rotor turn! I think my brother will be doing that. They were apparently able to get the bolts off without an issue too.
 
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