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What is causing my cooling fan to run for no reason?

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

scot850
Posts: 6389
Joined: Mon Apr 05, 2010 2:46 pm
Year and Model: 2000 V70 R
Location: Calgary, Alberta, Canada
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Re: What is causing my cooling fan to run for no reason?

Post by scot850 »

As has been suggested already:

1) Fan relay above radiator
2)ECT sensor
3) Wiring and connector issues
4) Unlikely, but igniton switch electrical portion.

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
98V70T5
Posts: 83
Joined: Tue Nov 02, 2010 9:45 pm
Year and Model: V70 T5 1998
Location: I wish it was Sweden

Re: What is causing my cooling fan to run for no reason?

Post by 98V70T5 »

Car is not my DD, and has be "relegated" to "project car status", meaning I must repair it at the lowest cost, and use my free labor (thanks to the accountant (wife)). I bought this car purely for the uniqueness it represents, as I remember drooling over a new yellow T5R back, sitting in the showroom, in the 90s, at the local dealership, when I worked there as a detailer. I don't have access to a heated garage, so it's been a long cold winter so far, and I'm strategizing a plan for when Spring comes. I was able to get it running after sitting for 18 months, just recently. As funny as it sounds, I like just sitting in the heated seat, each time I go to start it now, as I did driving it! Anyway I digress...

I find it interesting it works fine without the A/C. I was just throwing that out there to see if it could help pin point the cause more directly. Any online schematics for the fan? I'd love to spec out each piece. It has been just too darned cold to put the car on jack stands, and drain the radiator, to put the new ECT sensor in, or even go messing around with the wiring. I might get the courage up to swap out the fan relay, with a yard piece I pulled last Fall. Just need to heat up the engine to make disconnecting those 20+ year old plastic electrical connector tabs, come apart without breaking in this sub zero weather. Cheers!
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