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AC Cuts out after about 15 minutes....

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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Eddystone
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AC Cuts out after about 15 minutes....

Post by Eddystone » Sun Jun 14, 2020 2:55 pm

I have read a number of AC threads over the years, and I suspect my compressor clutch needs to be adjust (or maybe needs to have some pieces of zip tie inserted). I haven't yet had an opportunity to stop and check it when it starts blowing uncooled. When first started, the system gets nice and cold, then you realize after about 15 minutes that uncooled air is coming out of the vents.

Ideas? This is a 1999 S70t5 with the automatic temperature control module.
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Re: AC Cuts out after about 15 minutes....

Post by abscate » Sun Jun 14, 2020 3:47 pm

It’s a classic description of the excess clutch gap problem, which you can confirm with feeler gauges.

It is possible to drop the compressor and reshuffle the clutch without having to evacuate and recharge the AC but bread clips or zip ties is a much faster and effective solution.
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Re: AC Cuts out after about 15 minutes....

Post by misha » Sun Jun 14, 2020 3:53 pm

Abscate....
How do you measure clutch gap...when clutch is engaged or at rest(disengaged)?
I know that it should be around 0.3-0.5mm max,but i'm not clear on this.
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Re: AC Cuts out after about 15 minutes....

Post by erikv11 » Sun Jun 14, 2020 4:17 pm

Measure AC clutch gap at rest, car off. Just reach down there.
'95 854 T5-R, Motronic 4.4, 185k
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Re: AC Cuts out after about 15 minutes....

Post by misha » Sun Jun 14, 2020 4:24 pm

erikv11 wrote:
Sun Jun 14, 2020 4:17 pm
Measure AC clutch gap at rest, car off. Just reach down there.
So....at rest...when clutch is disengaged,it should be within spec(0.3-0.5mm).

What is a maximum allowable clutch gap,before problems begin?
Never had a problem with ac compressor,but want to be ready for it if needed.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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Re: AC Cuts out after about 15 minutes....

Post by erikv11 » Sun Jun 14, 2020 5:19 pm

My recollection from forum posts is they can get up to 0.7 or so without issue. Check yours and post it up! Since it is working. Or wade through a search :lol:. Seriously it's easy to test if you have a feeler gauge.

I'll try to check the gap on my V70 and post it up.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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Re: AC Cuts out after about 15 minutes....

Post by Eddystone » Sun Jun 14, 2020 5:43 pm

There's a photo credited to erikv11 for this AC clutch fix showing a part number 02AUG2012. Is this a Volvo number or something aftermarket?

I have been out to the car sticking my head in there and taking photos, and now I have three or four new projects to do on my perfectly running (except for the AC) car. Power steering hose. Maybe a serpentine belt. Heck, maybe it's time for the timing belt. Idler. Tensioner. Water pump. Camshaft lock, Camshaft seals. Camshaft. Crankshaft. Front subframe. It never stops...

I may just drive north and park it near Albany, but they're real snooty about taking free cars with auto boxes up there.
1998 V70 Non-Turbo/Auto
1993 945 Turbo/Auto
1999 S70 T5 Turbo/Auto
All U.S. market models.
All on the road and running.
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Re: AC Cuts out after about 15 minutes....

Post by erikv11 » Sun Jun 14, 2020 7:19 pm

Eddystone wrote:
Sun Jun 14, 2020 5:43 pm
There's a photo credited to erikv11 for this AC clutch fix showing a part number 02AUG2012. Is this a Volvo number or something aftermarket? ...
That "part" is a bread clip. The expiration date for the loaf of bread was Aug 12, 2012.

Image

For reducing the clutch gap, zip ties are the much better way to go, preferred over bread clips.
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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abscate
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abscate

Re: AC Cuts out after about 15 minutes....

Post by abscate » Sun Jun 14, 2020 7:27 pm

Ha! Probably have garage open for another month at least with Covid, but you are always welcome

Four hour drive from Philly, yo.

If you do use bread clips , don’t use wHEAT for an AC application, it won’t slice it, you can toast your compressor.
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Re: AC Cuts out after about 15 minutes....

Post by MoVolvos » Sun Jun 14, 2020 9:10 pm

misha wrote:
Sun Jun 14, 2020 3:53 pm
Abscate....
How do you measure clutch gap...when clutch is engaged or at rest(disengaged)?
I know that it should be around 0.3-0.5mm max,but i'm not clear on this.
Hope to get to this on our C30. Already one summer too many.





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