Testing cooling fan
 

Does anyone know the proper way of testing the cooling fan on a 1996 960? There are three wires coming from the plug going to the fan, a red, a green, and a black going to a ground somewhere. This is a 2 speed fan, do you have to put hot to both the green and red in order to check if fan is working?
Thanks for any help

Try both. Maybe one is for one speed and the other is for the other speed.

OK, I wasn't sure if I would ruin something by putting two hots to both green and red. Thanks

I checked fans, both hi and low are working fine but its still overheating and fans will not come on. Where should I go next? And after that? Thanks again

Do you know the actual temp? My fan does not come on that often. Do it try to overheat while the car is moving down the freeway or while in stop and go traffic.

The cooling system in cars are pretty basic. Thermostat, water pump, coolant, radiator, flow and fan (triggered by a temp sensor).

Post what is actually going on. I had no idea that your car was over heating because you posted that you were only concerned with testing the fan.

These white blocks (I5's and I6's) are pretty sensitive to over heating, it usually warps the head and causes a head gasket leak the 1st time it over heats.

Fans? There is only one fan.


Engine cooling fan is controlled by the ECU, not from a temp sensor on the radiator, like previous Volvos.

You need to check the relay points for proper voltage. You should also check its ground point (behind right headlight.) And you should also check the fusible link that's in-line (red wire) feeding the relay.

You can find the Wiring Diagram at the Resources sticky at the top.

Thanks for response everyone, I will try evrything noted. I wanted to ad, the fan used to run even when engine was turned of for a couple of minutes, is this normal too?

Yes, that's normal.

Does the Coolant Temp Gauge on the Instrument Panel work normally? A faulty ECT (Engine Coolant Temp) Sensor would provide erroneous info to ECU, which would keep the fan running longer after shutdown.

Yes the temp gauge is working normally, and to answer a previous question, I tested the 30amp hot lead going into the relay block and its got power to it. Where is the temp sensor on engine block? Thanks

Temp Sensor is on Thermostat Housing.