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'99 S70 Wobbly AC Compressor Pulley, Bypass Belt?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

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bmdubya1198
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'99 S70 Wobbly AC Compressor Pulley, Bypass Belt?

Post by bmdubya1198 » Sat Aug 11, 2018 9:36 pm

My cousin was complaining about a weird noise yesterday, and after he opened the hood today I immediately saw the problem... the A/C compressor pullley was wobbling like crazy.

He was just talking to me the other day about how the A/C cuts out on the highway when he goes more than about 70, then it'll come back on as he slows down. I thought that seemed strange, but figured the clutch would just need shimming (large gap after looking at it today).
It seems now that the clutch either failed completely or the pulley is bad.

After looking again, there are metal shavings sitting on the subframe below the compressor, presumably from the pulley rubbing against the compressor. Is this a common issue with the A/C that I've somehow never heard of? We tried to get a clutch/pulley (do they come off together?) at the junkyard today while we were there for something else, but ran out of time since the yard was closing.
Would a worn out clutch cause the pulley to wobble? I didn't get a good enough look at it today on his car because I was juggling a couple of projects, but it seems after some research that the clutch comes off after removing the 10mm screw, then the pulley can be removed. Does that sound right?
Strange thing is the noise isn’t as bad with the A/C on. Which would make sense since the clutch is holding stronger on the pulley, but I find it odd that the clutch still engages just fine.


Now to the next part... temporarily he wants to get a short belt to run without the A/C. Autozone's website showed that they had a belt for cars without A/C, but I have a hard time believing that when it was a 78" belt or something like that. Does anyone know the size required for the 1999-2000 style double-sided belt? I feel I remember a thread on here not too long ago about this topic, but I can't seem to find it.
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2003 S60 2.4T Silver/Black 112k
2007 XC90 V8 AWD Sport Titanium Grey/Black 166k
1991 944 Turbo Dark Green/Beige 173k
1992 245 Base White/Beige 249k
2006 BMW 330i
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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wizechatmgr
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Re: '99 S70 Wobbly AC Compressor Pulley, Bypass Belt?

Post by wizechatmgr » Sun Aug 12, 2018 2:47 am

I believe Abscate tried running a short belt on a '99 V70 and it was discovered that the alternator had a one way clutch. The belt ran it in the wrong direction and there was no charge as a result. Your mileage may vary...
Wisdom requires knowledge as a prerequisite, but knowledge can be developed due to a lack of wisdom.
In order to learn how to fix something, you must first learn how to break it.
1999 V70 XC AWD - ~187k miles

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bmdubya1198
Posts: 3920
Joined: Tue Dec 30, 2014 10:45 am
Year and Model: 2K V70R M56
Location: Charlotte, NC
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Re: '99 S70 Wobbly AC Compressor Pulley, Bypass Belt?

Post by bmdubya1198 » Sun Aug 12, 2018 7:48 am

wizechatmgr wrote:
Sun Aug 12, 2018 2:47 am
I believe Abscate tried running a short belt on a '99 V70 and it was discovered that the alternator had a one way clutch. The belt ran it in the wrong direction and there was no charge as a result. Your mileage may vary...
That's right, I should have known it was him that tried that!
2000 V70R Venetian Red/Charcoal M56 Swapped 195k
2003 S60 2.4T Silver/Black 112k
2007 XC90 V8 AWD Sport Titanium Grey/Black 166k
1991 944 Turbo Dark Green/Beige 173k
1992 245 Base White/Beige 249k
2006 BMW 330i
Sold-
2000 S70 GLT Mystic Silver/Taupe 253k
1993 944 Base Beige/Beige 221k
1998 V70 GLT Black/Beige 199k
1998 S90- Silver/Gray 207k
1995 850 GLT Tropic Green... crushed
2001 S60 2.4T Black/Black 230k
1988 744 Turbo M46 Beige Metallic/Beige 188k

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