I own a 2006 S60 2.5T. The engine fan has started to run fast and loud all the time. I was told that there is a speed sensor that controls the fan speed based on temperature readings. Does anyone know anything about this? If it is a sensor, can the sensor be replaced without buying a whole new fan assembly? What else should I be looking for?

 

Usually if the coolant temp sensor is bad it will set the check engine light.

 

I had the coolant temp sensor replaced (check engine light was on and engine went to "limp" mode). The fan now runs fast and loud (check engine light is not on). I was told there is a separate speed sensor for the fan.

 

It runs off of the ECT or from the A/C system thats all.

 

So, what do I need to do to fix this? My repair shop wants to replace the whole fan assembly.

 

Did they check codes for all the systems?

 

No codes are currently showing up. I had a check engine problem that indicated air mass meter. They replaced it. Then they discovered a leak in the the air hose from the air mass meter/air filterareato the engine at the "boot". They replaced that. One code said I needed a new A/C sensor. They replaced that. Now the fan runs fast all the time. My A/C condensor does leak and I was planning on replacing it in the Spring. So, what are your thoughts?

 

Maybe they put the wrong A/C sensor in the car. That can make the fan run like that.

 

Anything else I should have them check while I'm at it?

 

Is he a Volvo specialist?
He really needs to read codes out of all the systems including the A/C system.
He would also be able to read all the sensors if he has all the proper equipment.