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Radiator fan not coming on with 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
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CamZH
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Joined: Tue Jan 18, 2011 9:01 pm
Year and Model: '94 850 + '04 S60 R
Location: Sydney, Australia
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CamZH

Radiator fan not coming on with AC

Post by CamZH » Thu Jan 12, 2017 6:21 pm

Hi All,
Fringle, my '94 855 is having some AC troubles.
AC is generally working well, but for some reason the radiator fan is not turning on when the AC is turned on.


Am I right in thinking this should come on all the time ?
I've seen some posts about people saying sub 32F the fans dont come on, but I'm in Australia (Sydney) and it never gets that cold.

Any suggestions on what might cause this.
2004, S60R
1994, 850 T-5 Wagon

Ozark Lee
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Ozark Lee

Re: Radiator fan not coming on with AC

Post by Ozark Lee » Sat Jan 14, 2017 7:12 pm

There are a couple of things that come to mind. The most common is a bad fan relay and it can be tested fairly easily by individually grounding the relay pins associated with the yellow and the yellow/white wires on the center connector of the relay. One will turn the fan on at low speed and the other should turn it on at high speed. The fan relay is fairly cheap and it is very easy to change. The relay is on the fan shroud and I think it is still on the left side of the shroud even on a left hand drive car.

The other possible culprit, assuming that the AC is indeed functioning properly, is the high pressure switch on the AC system. The switch is expensive but they usually don't go bad. I have picked up used ones at a Pick-N-Pull and they always have worked.

...Lee
'94 850 N/A 5 speed
'96 Platinum Edition Turbo
Previous:
1999 V70XC - Nautic Blue - Totaled while parked.
1999 V70XC - RIP - Wrecked Parts Car.
1998 S70 T5
1996 850 N/A
1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe

CamZH
Posts: 38
Joined: Tue Jan 18, 2011 9:01 pm
Year and Model: '94 850 + '04 S60 R
Location: Sydney, Australia
Has thanked: 0
Been thanked: 0
Australia
CamZH

Re: Radiator fan not coming on with AC

Post by CamZH » Sun Jan 15, 2017 7:22 pm

thanks, I'll look into it. I have a feeling I might have a spare fan relay.
2004, S60R
1994, 850 T-5 Wagon

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