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2005 XC70 - Radiator cooling fan spinning out of control

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

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2005 XC70 - Radiator cooling fan spinning out of control

Post by skuliaxe » Thu Sep 26, 2019 9:25 am

I was driving around town a few days ago and suddenly I hear a noise from the engine bay. I opened the hood and the radiator cooling fan is blowing what it seems at maximum speed (like a leaf blower).

First I thought it was an heat issue, but that is not the case. Every time I turn on the car (even in the mornings) the fan goes full speed after about 5 seconds and stays like that until the car is shut off. I'm trying to not drive it in this state but it is the only car in the family and local dealers have a 2 week waiting period.

Does anyone here have any experience with this sort of issue? Searching online did not help and was mostly about the fan not spinning or spinning to slow.

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Re: 2005 XC70 - Radiator cooling fan spinning out of control

Post by jking4020 » Tue Oct 08, 2019 8:50 am

Sounds like the fan control regulator unit is bad. When they go bad the fan continuously runs. It happened on my car so I wired up a switch to the dashboard. You can buy a new fan somewhere with the new regulator module. something I will do in the future I'm sure. But using the switch is a cheap and quick fix. Just be sure it's at least a 40 amp connection and a high amp switch.

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Re: 2005 XC70 - Radiator cooling fan spinning out of control

Post by jimmy57 » Tue Oct 08, 2019 3:47 pm

In a north American market vehicle the check engine light (maybe Lambda lamp for you) should be on for a faulty coolant sensor. The coolant temp sensor having a fault will cause ECM to run fan at higher speed and continously since the true temp can't be sensed to avoid overheat.

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Re: 2005 XC70 - Radiator cooling fan spinning out of control

Post by precopster » Tue Oct 08, 2019 5:01 pm

On earlier P2 cars when fan goes full speed on earlier cars you can pull the purple wire from its connector to see if the fan continues to spin as this is the fan command wire from the ECM.

On our 2002 XC70 the fan continues to spin when the purple wire is disconnected so the fan controller is definitley toast.

On later cars the purple wire is integrated into the power connector making it harder unless you break the wire and resolder it.
Current cars:2002 XC70, 2006 Ssangyong Rodius (Stavic), 2006 XC90 2.5T, VW Transporter 2.5TDI


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