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Whining compressor

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.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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Fiodor
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Fiodor

Whining compressor

Post by Fiodor » Thu Jul 25, 2019 7:55 am

Hello dear people,

My A/C compressor whines when the clutch engages, in addition to that it cycles slowly (10 second cycles).

This issue appeared after my mechanic did a gas refill, could it be linked ?


1997 V70 T5 2.0 AWD with welded angle gear at 240k km
1990 740 Break (dead)

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misha
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Re: Whining compressor

Post by misha » Thu Jul 25, 2019 5:05 pm

Could be that he overfilled it.
Did he put oil within the gas?
System cycle when it it's low on gas or overfilled.
It also depends on outside temperature and system pressure which...again ....depends on outside temperature.
Are you sure that belt isn't making the noise under load?


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
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'73 144 De Luxe
'78 244 DL
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Fiodor
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Fiodor

Re: Whining compressor

Post by Fiodor » Fri Jul 26, 2019 12:53 am

He didn't put any oil, it was a single use can.
The noise comes from the compressor area and only happens when the clutch engages.


1997 V70 T5 2.0 AWD with welded angle gear at 240k km
1990 740 Break (dead)

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misha
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Re: Whining compressor

Post by misha » Fri Jul 26, 2019 3:22 am

I had a problem with some noise from the compressor when my old belt was dry and had a little cracks on the lines.
It made noise ONLY when i turn on ac...replaced belt and no more noise.
In your case it could be that compressor is starving for oil.
When ac is being serviced in ac shop they always put some amount of oil through gas line.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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wizechatmgr
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wizechatmgr

Re: Whining compressor

Post by wizechatmgr » Sat Jul 27, 2019 6:15 pm

Need to get a gauge set hooked up and see what your pressure goes down to while the compressor is active. It could be that the orifice tube is clogged or that the pressure gets so low that it cuts the compressor off due to pulling a temporary vacuum.


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In order to learn how to fix something, you must first learn how to break it.
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callahanoffroad
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Re: Whining compressor

Post by callahanoffroad » Tue Jul 30, 2019 10:47 am

Mine made that noise when it was overfilled.


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