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Radiator Fan - How to Test?

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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Radiator Fan - How to Test?

Post by volvocommander » Sun Apr 14, 2019 8:12 pm

Hey all,

I have a 96 Volvo 850 R with a radiator fan that will not turn on under any conditions. I'd like to check that it is the Fan for sure before replacing the assembly.

I've just replaced the relay just above the Fan to no avail.

Is there a way I can supply power from the battery to the Fan directly, to test the motor? Or is there another way you'd recommend?


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Re: Radiator Fan - How to Test?

Post by WhatAmIDoing » Sun Apr 14, 2019 9:04 pm

Pull the relay off the shroud. Ground the low or high (not both at same time) speed fan wire to the intake manifold. Should make the fan come on, unless there is a wiring issue or the motor is dead. If nothing happens, you will have to trace the positive and ground wires off the fan motor and make jumpers to connect it directly to the battery to confirm if motor is dead.
'98 S70 T5M - 282,000+mi - forever a project
'99 S70 "AWD" - 220,000+mi - part out :cry:
Knows enough to be dangerous :wink:

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