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AC Relay / Volvo V70 1999 Base Model

Help and Advice on Volvo's extremely popular car line, powered by Volvo's nearly indestructible, versatile inline 5-cylinder engine.
1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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AC Relay / Volvo V70 1999 Base Model

Postby Mark Spencer » 11 Oct 2009, 23:34

My AC stopped blowing cold. I heard some "clicking" (cycling????) while the AC was on for about a month, although it worked fine. Now the clicking has stopped, and so has the cold air. EVERYTHING else in the climate control system seems to work fine, as before, I just get no cold air, and am quite sure the compressor isn't kicking on. The service light came on today and I checked out the code with my code reader and it said I had one code....0645 - AC Clutch Relay Control Circuit. Is this the relay that resides behind the glove box? The one in this....

http://img149.imageshack.us/img149/6334 ... aysop5.jpg

...illustration? And, were I to replace it, might this solve my problem, or is it likely something deeper? I SUPPOSE it could be the refrigerant, but I seriously doubt it, it has been flawlessly blowing ice cold air until this little problem cropped up. I see they're under 20 bucks, should I just drop one in and see? Anything else I need to know about this other than replacing, or to look for?

Many many thanks,
Mark
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Joined: 29 Aug 2009, 05:11
Location: Brooklyn, NY
Model and Year: 1999 V70 Base Model

Re: AC Relay / Volvo V70 1999 Base Model

Postby Ozark Lee » 12 Oct 2009, 06:10

You symptoms sound like a classic case of a low charge of R-134A. At the end of the day you likely have a slow leak in the evaporator but you can usually get by for a while by just recharging the system.

...Lee
'94 850 N/A
'96 850 N/A
'96 Platinum Edition Turbo
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1986 740 GLT
1972 142 Grand Luxe
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Re: AC Relay / Volvo V70 1999 Base Model

Postby Mark Spencer » 12 Oct 2009, 20:25

Ozark Lee wrote:You symptoms sound like a classic case of a low charge of R-134A. At the end of the day you likely have a slow leak in the evaporator but you can usually get by for a while by just recharging the system.

...Lee


So on a V70, when the refrigerant is low, the compressor won't kick in? Just wondering, even when my old 740 GLE was low on refrigerant, you could still hear the compressor kick in and tell that it was taxing the engine slightly.
Mark Spencer
 
Posts: 3
Joined: 29 Aug 2009, 05:11
Location: Brooklyn, NY
Model and Year: 1999 V70 Base Model

Re: AC Relay / Volvo V70 1999 Base Model

Postby Ozark Lee » 12 Oct 2009, 21:07

So on a V70, when the refrigerant is low, the compressor won't kick in?


That is correct. There is a low pressure switch on the suction line near the firewall that kills the system when the pressure gets too low. You can verify that it is a low charge by jumping the switch connector with a paper clip. Don't run the system very long as it can damage the compressor to run it with a low coolant charge.

...Lee
'94 850 N/A
'96 850 N/A
'96 Platinum Edition Turbo
'98 S70 T5
'99 V70XC
Previous: 1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe
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Re: AC Relay / Volvo V70 1999 Base Model

Postby Sperry » 12 Oct 2009, 21:47

I had the same issue. The mechanic said, "It doesn't appear to be very low", but after fully charging the system, the AC worked nearly perfectly the rest of the season.

I have a second, unexplained issue that shuts off the AC if the car gets really hot, stuck in city driving on the hottest of days.
1994 850 Turbo Sedan. 202,000, and getting more experienced, not older. - sold
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Re: AC Relay / Volvo V70 1999 Base Model

Postby Ozark Lee » 12 Oct 2009, 22:43

I have a second, unexplained issue that shuts off the AC if the car gets really hot, stuck in city driving on the hottest of days.


There is a thermal cutout on the clutch and you likely need to re-shim the clutch to get it working consistently. Details are in these threads:

viewtopic.php?t=7369&postdays=0&postorder=asc&start=20

...Lee
'94 850 N/A
'96 850 N/A
'96 Platinum Edition Turbo
'98 S70 T5
'99 V70XC
Previous: 1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe
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Ozark Lee
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Re: AC Relay / Volvo V70 1999 Base Model

Postby Red-Arrow » 29 Sep 2010, 11:09

Can anybody confirm the location of the Relay for the AC compressor?
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Re: AC Relay / Volvo V70 1999 Base Model

Postby Ozark Lee » 30 Sep 2010, 00:08

It should be on a small metal shelf directly behind and a little below the glove box.

...Lee
'94 850 N/A
'96 850 N/A
'96 Platinum Edition Turbo
'98 S70 T5
'99 V70XC
Previous: 1989 740 GLT
1986 740 GLT
1972 142 Grand Luxe
User avatar
Ozark Lee
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Posts: 11657
Joined: 07 Sep 2006, 14:24
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