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Sound like rocks rattling near serpentine blt 99 s70

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olpossum
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Sound like rocks rattling near serpentine blt 99 s70

Post by olpossum » Fri Jul 06, 2018 1:19 pm

280,000 miles, fairly up to date - wtr pump,timing belt kit changed recently, but the A/C system has never been touched. Started experiencing occasional short (5-15 sec.)periods of rumbling/rattling near the A/C compressor, whether A/C is on or not. Not real loud,only heard it while the car's idling. The Air gap is in the middle of its range. A/C is cold. With a stethoscope,the sound might be the clutch bearing but can't see any play. With the serpentine belt off, the tensioner is pretty loose. Could that be the issue? When this occurs,with the car idling, I can't see anything wrong. There is no whine, the rattle is the only thing I can hear. I think when the noise is occurring, the car loses a bit of power, not much. Is an internal compressor noise possible? It sounds sort of internal. Thanks.



sventastic
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Re: Sound like rocks rattling near serpentine blt 99 s70

Post by sventastic » Fri Jul 06, 2018 1:32 pm

Does the noise occur when the engine is off and the ignition is in the accessory position? I had a similar noise that I thought was from the PS pump/serpentine belt but turned out to be one of my headlight wiper motors freaking out. Disconnected the motor and the noise stopped.


1996 854R | M56H | 16T | 251k

olpossum
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Re: Sound like rocks rattling near serpentine blt 99 s70

Post by olpossum » Fri Jul 06, 2018 2:24 pm

No, it only happens when the car's running. I know what you're talking about, though, another S70 we had did that thing with the headlight wiper motor years ago. I appreciate your prompt reply.
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sventastic
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Re: Sound like rocks rattling near serpentine blt 99 s70

Post by sventastic » Fri Jul 06, 2018 3:09 pm

Gotcha, no problem.

Where and in what way is the tensioner loose? If I recall correctly it's held on by two bolts. Are they both tight? Does the pulley have any play?


1996 854R | M56H | 16T | 251k

olpossum
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Year and Model: 03 V70, 99S70
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Re: Sound like rocks rattling near serpentine blt 99 s70

Post by olpossum » Fri Jul 06, 2018 3:18 pm

Yeah, it's the pulley, appears to be plastic. It's somewhat loose on the shaft. I'm going to get a new one, but would that make this noise? The tensioner is bolted securely in place.



Ben850
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Re: Sound like rocks rattling near serpentine blt 99 s70

Post by Ben850 » Sun Sep 16, 2018 8:10 am

Was the timing belt tensioner replaced when that job was done? My '93 had made that noise with a bad one.


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