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Radiator Fan Speed, When it Should Run

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

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Re: Radiator Fan Speed, When it Should Run

Post by bmdubya1198 »

esl_97_850_T5 wrote: Wed Mar 20, 2019 2:26 pm Testing the radiator fan of 96-97 850 / 97-98 S70/V70/C70/XC70 whose ECM is Motronic 4.4 -- by forcing the fan on High or Low for a short time -- can also be performed by xiaotec "850 OBD-II" Android app V1.1.6. Presumably the more recent "850 OBD-II" versions also have the ability to control the radiator fan on 96-98 850/SVC70 with M44.
I got this app a while back, and I was having issues testing the fan with it. I messaged the developer and he was able to fix that in an update. I was able to test both speeds of my fan, and it turned out I had the wires reversed (pig tail broke apart a long time ago).

Much easier setup than Volvo 850 diag, and it's a very useful app for '96-'98 P80s.
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Re: Radiator Fan Speed, When it Should Run

Post by BlackThunder »

Thanks for the info. OBD II over Bluetooth is awesome.

2013 Volvo C30 T5
1997 Volvo 850 NA Sold to a New Volvo Enthusiast
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