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Air conditioning issues Topic is solved

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Mike Langlois
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Air conditioning issues

Post by Mike Langlois » Tue Sep 03, 2019 5:07 pm

Greetings,
My 2002 V70 X/C decided give me a chance to learn about Air conditioning today and it is still over 100 degrees f in California. The A/C was working fine and started blowing warmer air. Compressor did not seem to be engaging. I researched A/C, then checked pressures. The readings were 30/40 and 250 and it was about 100 degrees. In my infinite wisdom, I added (or possibly thought I added) a few ounces of Freon. I ran 70 miles on the car on an 80 degree morning, with the A/C both on and off; everything seemed to be working fine. The next day everything seemed to work, but the warm air started again after the car ran for about 1/2 hour. Checked pressures and they were 80 and 350 (verified with a second set of gauges) with the car hot on a 100+ degree day.
It seems that the A/C works fine for about 15 minutes (when the car is cool), then starts blowing warm air. A/C clutch is not engaged and the low side line, which should be cold, is very hot. Last readings were 70-80 psi low side and 350-375 high side; 100+ degrees ambient air temp, 36% relative humidity. I am new to A/C and any thoughts or advice would be appreciated.



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June
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Re: Air conditioning issues

Post by June » Tue Sep 03, 2019 5:52 pm

It's overcharged or the condenser coils are cloged with dead bugs or dirt, or the high fan speed is not engaging. Clean the condenser with a pressure washer and recheck the high/low pressure. If it is still running high numbers it's likely overcharged, have it evacuated and recharged. June


My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

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- Pete -
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Re: Air conditioning issues

Post by - Pete - » Tue Sep 03, 2019 9:51 pm

Did you measure the gap between the clutch & the AC compressor pulley? I’ll include a video.

I’ve seen varying specs, but seems clutches cease to work once the gap reaches .60ish mm and beyond.

There’s an awful lot of documentation & discussion regarding shimming the clutches on these. If your clutch is not engaging this would be what I’d look at first. Over time & considering wear, the electromagnet in your AC clutch isn’t able to pull the clutch assy towards itself, which is effectively why your AC won’t kick on.

You’ve probably overcharged, yes. But I don’t think that’s your issue, since the issue you had prior to charging didn’t change after charging.




2/4 of our P2's are on the docket for this prior to cooler temps. AC is just as important in winter as in summer.
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Re: Air conditioning issues

Post by velorider » Wed Sep 04, 2019 12:28 am

I agree with Pete. The hotter it is the more the gap effects engagement. Last summer mine acted up on hot days when not moving. When moving it got better. On cool days had less of an issue. After fixing the gap it has worked fine.



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Re: Air conditioning issues

Post by June » Wed Sep 04, 2019 1:07 am

There's no way you have a slipping clutch from a gap problem with a high pressure reading of 300-375. Mike says you overcharged the system. He says 134a is not forgiving. June


My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

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Mike Langlois
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Re: Air conditioning issues

Post by Mike Langlois » Wed Sep 04, 2019 8:56 am

I am learning and believe I overcharged. My readings were pretty close to start with, so I will evacuate, recharge and check the clutch. Thank you one and all for the advice- it is hot out here. Mike



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Re: Air conditioning issues

Post by Katten » Thu Sep 05, 2019 7:07 am

What does the gap have to do with preussare? If the gap is too large on the magnetic clutch it will not engage at any preasure :). If gap is correct it will only engage at correct preasure.



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Re: Air conditioning issues

Post by June » Thu Sep 05, 2019 8:08 am

Katten wrote:
Thu Sep 05, 2019 7:07 am
What does the gap have to do with preussare? If the gap is too large on the magnetic clutch it will not engage at any preasure :). If gap is correct it will only engage at correct preasure.
Your thinking is either it's on or off, black or white when there is a in between gray area.

Think of a standard transmission clutch that's wearing and beginning to slip. It's the same principle. The compressor clutch wears a bit at a time. The higher the pressure in the liquid line, the more resistance on the clutch ie more engine horsepower required to turn the compressor. Therefore a worn clutch may not slip with a high side reading of 175, but completely slip at 300. Once it starts slipping, the clutch will burn up fast.

The OP stated the high side was running 300-375. A worn/ slipping clutch would not stay engaged at a idle to achieve a reading that high. June


My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

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Mike Langlois
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Mike Langlois

Re: Air conditioning issues

Post by Mike Langlois » Thu Sep 05, 2019 8:21 am

So, I am learning and it appears that I did overcharge the system after the problem started. Checked the clutch clearance and had over .9mm, when the gap should be .4mm-.6mm. I will drain and recharge the system and attempt to fix the gap. Can a compressor clutch be replaced?



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Re: Air conditioning issues

Post by - Pete - » Thu Sep 05, 2019 9:30 am

There's a guy on YouTube, TexasCoder I believe, that shows replacing a clutch on an XC90 without cracking open the refrigerant lines. I don't know if this is even possible on the XC70 though, I haven't attempted it the way he shows. Supporting the engine from above and lowering the front of the subframe is the most common way to access the clutch.
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