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Old 04-15-2012, 12:21 AM   #1
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Turned on AC grinding noise

Hello Again, Here with another issue, looking for some guidence.

So I turned on my AC the other day (clicked the AC button) and I heard what sounded like a griding noise coming from the engine compartment for a second. Sounded kind of a tire rub. I pulled over because I thought the fan was hitting some wires or something. Everything was clear.

I turned the AC off, and on, didnt happen again.

Now the same thing happened again today. I turned the AC on, grinding noise, then it wouldn't happen again when I was trying to figure it out.

I am having a bit of trouble trying to diagnose what this could be.

Any help would be greatly appreciated.

Thank you,
John

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Old 04-15-2012, 01:17 AM   #2
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Originally Posted by Johnnyp View Post
Hello Again, Here with another issue, looking for some guidence.

So I turned on my AC the other day (clicked the AC button) and I heard what sounded like a griding noise coming from the engine compartment for a second. Sounded kind of a tire rub. I pulled over because I thought the fan was hitting some wires or something. Everything was clear.

I turned the AC off, and on, didnt happen again.

Now the same thing happened again today. I turned the AC on, grinding noise, then it wouldn't happen again when I was trying to figure it out.
I am having a bit of trouble trying to diagnose what this could be.

Any help would be greatly appreciated.

Thank you,
John
I would strongly suspect the bearings in your A/C compressor have gone bad. Have it checked asap or you could have your whole A/C system filled with metal shavings and that's expensive to flush out.

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Old 04-15-2012, 09:06 PM   #3
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Thanks, just checked and the bearings and clutch seem good.

Any other ideas?
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Old 04-15-2012, 09:13 PM   #4
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Thanks, just checked and the bearings and clutch seem good.

Any other ideas?
Since I can't stick my head under hood, just about anything I come up with would be no more than a wild-ass-guess. So, here's a couple:

1) How about you stick your head under the hood while someone starts the A/C and see if you can identify the exact area the sound is coming from.

2) The Serpintine belt okay? The added load from the compressor kicking in affects the belt and anything else running off it.

If the A/C bearings are indeed okay - #2 would be the next thing I'd be looking at.

Let's see where #1 and #2 gets you.
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Old 04-15-2012, 09:22 PM   #5
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Since I can't stick my head under hood, just about anything I come up with would be no more than a wild-ass-guess. So, here's a couple:

1) How about you stick your head under the hood while someone starts the A/C and see if you can identify the exact area the sound is coming from.

2) The Serpintine belt okay? The added load from the compressor kicking in affects the belt and anything else running off it.

If the A/C bearings are indeed okay - #2 would be the next thing I'd be looking at.

Let's see where #1 and #2 gets you.
Yeah, I appreciate your "wild ass guesses" since mine arent getting me anywhere.

The problem is, it seems sporadic. Today, I couldn't get it to happen for the life of me. If I had my head in there when it happened I would be able to figure it out

Thanks for your help
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Old 04-15-2012, 09:27 PM   #6
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The problem is, it seems sporadic.
Surprisingly, that helps.

I looked at your Jeep profile but it doesn't say how old it is.
What year and how many miles?
What percentage of town/highway driving?
Do much mudding or rock crawling?
You drive like grandma or a 17 year old on a sugar high?
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Old 04-15-2012, 09:30 PM   #7
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Surprisingly, that helps.

I looked at your Jeep profile but it doesn't say how old it is.
What year and how many miles?
What percentage of town/highway driving?
Do much mudding or rock crawling?
You drive like grandma or a 17 year old on a sugar high?
Its a 2011, just over 10k miles.
20%town/80% highway
I do both mudding and rock crawling. I "think" this problem started BEFORE my first time mudding with this JK.
Hate to admit it, but I drive like a grandma.
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Old 04-15-2012, 09:43 PM   #8
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Its a 2011, just over 10k miles.
20%town/80% highway
I do both mudding and rock crawling. I "think" this problem started BEFORE my first time mudding with this JK.
Hate to admit it, but I drive like a grandma.
Lining up my WAGs in the order I'd tackle them:
Mud/dirt in the alternator (a quick look is all that's needed)
All pulleys for the Serpintine belt (loosen the belt and spin stuff by hand to see how free everything is)
The belt itself - condition/tension (Try tighten it a hair. Wait and see)

I'm really stretching here but I'm suspecting the belt is a key to getting to the real problem.

The fact that this happens when you turn on the A/C makes me suspect the additonal load is affecting something for a second. It could be the belt slips and then heats up and grabs again. I know, this usually is a squealing sound but I've heard the grinding sound too.

Or, the additional load is causing a pully bearing to compain for a second. This could come from water (do much river fording?) cutting the bearing lubrication or just plain old premature failure.

If the belt is glazed and shiny I'd swap the bugger and call it a day until it happens again - if it does.

Or just do nothing until the problem stops being sporatic. Usually the option most take.
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Old 04-15-2012, 09:56 PM   #9
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Lining up my WAGs in the order I'd tackle them:
Mud/dirt in the alternator (a quick look is all that's needed)
All pulleys for the Serpintine belt (loosen the belt and spin stuff by hand to see how free everything is)
The belt itself - condition/tension (Try tighten it a hair. Wait and see)

I'm really stretching here but I'm suspecting the belt is a key to getting to the real problem.

The fact that this happens when you turn on the A/C makes me suspect the additonal load is affecting something for a second. It could be the belt slips and then heats up and grabs again. I know, this usually is a squealing sound but I've heard the grinding sound too.

Or, the additional load is causing a pully bearing to compain for a second. This could come from water (do much river fording?) cutting the bearing lubrication or just plain old premature failure.

If the belt is glazed and shiny I'd swap the bugger and call it a day until it happens again - if it does.

Or just do nothing until the problem stops being sporatic. Usually the option most take.
I think your WAGs have given me some clear insight on where the problem most likely lies. I am going to the check the Alternator (which I didn't check) and the belt much better tomorrow.

I prefer not waiting until a problem is catastrophic before I address it.

Thank you again for your help
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Old 04-15-2012, 09:58 PM   #10
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I think your WAGs have given me some clear insight on where the problem most likely lies. I am going to the check the Alternator (which I didn't check) and the belt much better tomorrow.

I prefer not waiting until a problem is catastrophic before I address it.

Thank you again for your help
You're welcome. Lemme know what you find. I need closure

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