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96 Volvo 850 a/c clutch not engaging

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
1997 - 2000 V70-XC
1997 - 2004 C70

JimBee
Posts: 1769
Joined: Tue Dec 09, 2008 9:23 pm
Year and Model: 93 and 2 96 850's
Location: Minneapolis
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JimBee

96 Volvo 850 a/c clutch not engaging

Post by JimBee » Tue Jun 16, 2020 6:08 pm

A couple of years ago I had the a/c pulley off and took out a shim to set the a/c clutch factory clearance. The car hasn't seen many miles since so I'm pretty confident the setting is correct. But the clutch isn't engaging with the a/c and recirc switches set to on, and the blower fan at 3.

There's a relay under the dash. I don't remember the electrics.

Guidance on where to start troubleshooting would be appreciated.

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misha
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Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
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misha

Re: 96 Volvo 850 a/c clutch not engaging

Post by misha » Tue Jun 16, 2020 6:24 pm

First,take the car to ac shop to check freon level.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / 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

JimBee
Posts: 1769
Joined: Tue Dec 09, 2008 9:23 pm
Year and Model: 93 and 2 96 850's
Location: Minneapolis
Has thanked: 13 times
Been thanked: 27 times
United States of America
JimBee

Re: 96 Volvo 850 a/c clutch not engaging

Post by JimBee » Tue Jun 16, 2020 6:32 pm

I knew the freon was down since there's a slow leak, probably in the dash. I charged it last year and it was okay for the summer. Today, I put the gauges and vacuum pump on it, registered about 5 lbs + pressure before pumping. It took just a few minutes to get to minus 30. Then when it wouldn't take freon from the can I discovered the clutch wasn't turning.

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