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AC Failure. Blows constant hot air. (96 850 Turbo Wagon)

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

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jakethesnake
Posts: 5
Joined: Mon Jul 23, 2018 6:21 pm
Year and Model: 1996 850 Turbo Wagon
Location: Woodlan
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AC Failure. Blows constant hot air. (96 850 Turbo Wagon)

Post by jakethesnake »

Hey forum,

had to take the fuse out, because my AC (no matter what setting) is blowing hot air at full blast, even when knob is at off.
I tried recharging it, but still hot air.

Pls help, its 105° where I live :oops:


Jake
dj_v70
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Joined: Sat Jul 19, 2014 1:51 pm
Year and Model: v70 2003
Location: ri
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Re: AC Failure. Blows constant hot air. (96 850 Turbo Wagon)

Post by dj_v70 »

Electrical diagrams are here:
http://www.volvowiringdiagrams.com/volv ... agrams.pdf

Map out your components and check voltages at ac relay, etc. Report back with any questions.
JimBee
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Joined: Tue Dec 09, 2008 9:23 pm
Year and Model: 93 and 2 96 850's
Location: Minneapolis
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Re: AC Failure. Blows constant hot air. (96 850 Turbo Wagon)

Post by JimBee »

Before tracing out the electrical issue, I would make sure you're a/c clutch clearance is really close, as in .3 mm. Much wider than that, clutch won't engage the compressor. The gap can be measured from under the car, quick fixes with zip ties are described on this forum. I'm wondering if a stuck relay might cause the always-on condition.
mecheng
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Year and Model: 1998 Volvo S70 T5
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Re: AC Failure. Blows constant hot air. (96 850 Turbo Wagon)

Post by mecheng »

The clutch gap spec is actually 0.3-0.6mm, it will engage higher than 0.6, my car it is 0.8, but the a/c is fine and I’ve learned in life to leave well enough alone. You may have a sensor problem
1998 Volvo S70 T5 - SE - 240km - Sold July 2018
1997 Volvo 850 GLT - 190km
Boost is my drug of choice
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