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'99 S70 Base, FWD, Auto -- Whistling Sound-- AC?

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
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
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E Showell
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E Showell

'99 S70 Base, FWD, Auto -- Whistling Sound-- AC?

Post by E Showell » Sat Jul 29, 2017 1:20 pm

I know the high pitched electronic whistling sound of the throttle body.

Since A/C recharge by local independent, I get a high pitched whistling for between 4 and 8 seconds (approx.) whenever I first engage A/C or when I shut off A/C.

Any ideas as to what this might be attributable (and please don't say: "The A/C system")? It is definitely not the throttle body singing.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)

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abscate
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abscate

Re: '99 S70 Base, FWD, Auto -- Whistling Sound-- AC?

Post by abscate » Sun Jul 30, 2017 4:30 am

My Beetle has done this for three years. High frequency stuff usually means little damage

:-) ( there actually is scientific basis for that statement)

A little resonance in the compressor as it pumps up the high pressure side, perhaps?

With your awareness skills, just monitor for change and enjoy your AC

On edit...and if I had your comprehension skills I would have caught this
whenever I first engage A/C or when I shut off A/C.
Happening on shut down too...almost certainly confirming a flow resonance somewhere , not to worry
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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Clemens
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Re: '99 S70 Base, FWD, Auto -- Whistling Sound-- AC?

Post by Clemens » Sun Jul 30, 2017 2:45 pm

My 95 has done that for years. Still working like a charm. Just to prove abscate's statement. Also, he is a mod, hence he's always right...
Summer: 1996 855 R
Winter: 1994 855 T5M
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JRL
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Re: '99 S70 Base, FWD, Auto -- Whistling Sound-- AC?

Post by JRL » Sun Jul 30, 2017 4:15 pm

Semi clogged Orafice tube?
Only when the AC is turned on? A clogged breather makes a non turbo whistle
2000 V70R Black, 144,000 miles Wife's R.
2007 V70 2.5T White/Oak 111,000 MILES. Polestar tune, IPD bars, rear spoiler, dark grey Thors, DWS 06, HU850, sub.

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E Showell
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E Showell

Re: '99 S70 Base, FWD, Auto -- Whistling Sound-- AC?

Post by E Showell » Sun Jul 30, 2017 4:43 pm

Breather?
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic
'95 855 auto (sold)
'86 245 manual (sold)

scot850
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scot850

Re: '99 S70 Base, FWD, Auto -- Whistling Sound-- AC?

Post by scot850 » Sun Jul 30, 2017 10:54 pm

Have you tried to use a piece of tube or a stethoscope to listen for the location on the noise? You will need the help of an able assistant to activate and deactivate the A/C.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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BEJinFbk
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BEJinFbk

Re: '99 S70 Base, FWD, Auto -- Whistling Sound-- AC?

Post by BEJinFbk » Mon Jul 31, 2017 1:09 am

Mine has whistled on shutdown since I got it in'05.
Blows snowflakes - I have officially moved on. 8)
'98 V70 R - Well Equipped for Life Up North... ;)

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