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AC Relay / Volvo V70 1999 Base Model

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Mark Spencer
Posts: 3
Joined: Fri Aug 28, 2009 11:11 pm
Year and Model: 1999 V70 Base Model
Location: Brooklyn, NY

AC Relay / Volvo V70 1999 Base Model

Post by Mark Spencer » Sun Oct 11, 2009 5:34 pm

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

Ozark Lee
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Re: AC Relay / Volvo V70 1999 Base Model

Post by Ozark Lee » Mon Oct 12, 2009 12:10 am

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

Mark Spencer
Posts: 3
Joined: Fri Aug 28, 2009 11:11 pm
Year and Model: 1999 V70 Base Model
Location: Brooklyn, NY

Re: AC Relay / Volvo V70 1999 Base Model

Post by Mark Spencer » Mon Oct 12, 2009 2:25 pm

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.

Ozark Lee
MVS Moderator
Posts: 14505
Joined: Thu Sep 07, 2006 8:24 am
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Location: USA Midwest
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Re: AC Relay / Volvo V70 1999 Base Model

Post by Ozark Lee » Mon Oct 12, 2009 3:07 pm

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

Sperry
Posts: 236
Joined: Thu Nov 09, 2006 11:57 pm
Year and Model: 850 Turbo 1994
Location: Mid-Atlantic region

Re: AC Relay / Volvo V70 1999 Base Model

Post by Sperry » Mon Oct 12, 2009 3:47 pm

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

Ozark Lee
MVS Moderator
Posts: 14505
Joined: Thu Sep 07, 2006 8:24 am
Year and Model: Many Volvos
Location: USA Midwest
United States of America

Re: AC Relay / Volvo V70 1999 Base Model

Post by Ozark Lee » Mon Oct 12, 2009 4:43 pm

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:

http://www.matthewsvolvosite.com/forums ... c&start=20

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

Red-Arrow
Posts: 449
Joined: Thu Aug 26, 2010 1:07 am
Year and Model: 850 T5 1995
Location: Scotland.

Re: AC Relay / Volvo V70 1999 Base Model

Post by Red-Arrow » Wed Sep 29, 2010 5:09 am

Can anybody confirm the location of the Relay for the AC compressor?
Life would be enjoyable if it wasn't so painful to live.

Ozark Lee
MVS Moderator
Posts: 14505
Joined: Thu Sep 07, 2006 8:24 am
Year and Model: Many Volvos
Location: USA Midwest
United States of America

Re: AC Relay / Volvo V70 1999 Base Model

Post by Ozark Lee » Wed Sep 29, 2010 6:08 pm

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

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

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