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850 Rescue

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
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Jaybar
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Joined: Wed Jul 27, 2016 6:19 pm
Year and Model: 95,97 850
Location: Manchester,NH

850 Rescue

Post by Jaybar »

I bought this old girl at auction momma wants to run it. The problem is I can't get the compressor for A/C to turn on nor can I get the auxillary fan to work also. Any feedback is great. 1995 850 GLT with 115K.
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RickHaleParker
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Re: 850 Rescue

Post by RickHaleParker »

Auxillary fan won't come until it is needed. Are you getting the engine hot enough it is needed?

Turn the A/C on full, disconnect the wire harness from the A/C Pressure Switch. With a paper clip jump the wire harness. If the compressor clutch engages the A/C is low on refrigerant and may have a leak.

Do not attempt to run the A/C with the paper clip in place, keep it in place just long enough to do the test, then remove it.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
Jaybar
Posts: 35
Joined: Wed Jul 27, 2016 6:19 pm
Year and Model: 95,97 850
Location: Manchester,NH

Re: 850 Rescue

Post by Jaybar »

Thanks will try that tomorrow. I let it run for about 20 minutes thought that was long enough seeing it's 85 and humid was going to try and jump that also from reading other posts. I was thinking but not sure if the TCM was bad would that effect both systems?
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Clemens
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Re: 850 Rescue

Post by Clemens »

The other thing very common with those is the compressor clutch gap getting too big. Read up on the ghetto fix with zip ties or bread clips. It´s worked like a acharm for years on 2 of our 850ies.
Summer: 1996 855 R
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sventastic
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Re: 850 Rescue

Post by sventastic »

Does the gap getting too big cause the compressor to never engage? My clutch has stopped engaging entirely as well, and just recently this week got the system refilled but the compressor still did not click on.
1996 854R | M56H | 16T | 274k | BC, Canada
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abscate
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Re: 850 Rescue

Post by abscate »

If it’s is really fat , yes, the compressor will never engage. Probably something like 0.8mm or bigger

You can just pull the connector of the compressor and apply 12 volts to see if it clicks, engine off.
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Jaybar
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Joined: Wed Jul 27, 2016 6:19 pm
Year and Model: 95,97 850
Location: Manchester,NH

Re: 850 Rescue

Post by Jaybar »

Update I tried the paperclip jumper and the compressor will kick on. What's next. I also tried jumping fan with no success and the thermostat sits where it should half way.
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erikv11
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Re: 850 Rescue

Post by erikv11 »

See Rick's post: likely the AC is low on refrigerant and that's next on the list.

I'd also check the clutch gap on the AC compressor. If it is huge, shrink it down with zip ties or mechanic's wire.
'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, 293k
'06 S60 R, 167k
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
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RickHaleParker
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Re: 850 Rescue

Post by RickHaleParker »

I tried the paperclip jumper and the compressor will kick on. What's next.

It is low an refrigerant. It needs to be pumped down (evacuated) and checked for leaks. If no leaks, a refrigerant recharge.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
scot850
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Re: 850 Rescue

Post by scot850 »

If re-filling it is worth having dye added to the refrigerant. If there is a leak then this will help identify the source. 2 main issues are stone damage to the condenser, and a rust hole in the evaporator. 850's mostly did not come with a cabin filter so leaves and other stuff can get down into the evaporator and then sit and fester with damp which rusts out the evaporator.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold
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