E60 cooling fan test

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  1. E60 cooling fan test 
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    Hi guys my BMW E60 520 (2.2) recently overheated, causing headgasket to fail. I have had all the work carried out, head skim and pressure test., new water pump, temp sensors, thermostat. It's now overheating again and I think the fan is at fault. As I can not hear it working. Before I spend crazy money on a new electric fan how do I test it's working. The fan has three wires one black,red (thick) and a thin wire? The fan is off the car currently.

    Any help would be great,

    Steve
     
     

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    With diagnostics like DIS you can activate the fan via engine ECU (DME/DDE). The fan has continuous voltage and ground (thick wires) and PWM control from engine ECU (thin wire).
     
     

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    Should I be able to get it to work off a power probe off the car?????
     
     

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    Hi guys

    I fitted the cooling fan today and started the car, I then turned on the A.C and the car only blew out hot air not the cold it usually is. Fan still not work no on either setting slow or fast. Where is the relay for the fan located might be worth having a look at that or am I missing something. (I have bridged the wires on the sensor on the bottom hose and nothing happens.

    Thanks guys

    Steve
     
     

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    If your fan isn't working then the ecu will not activate aircon.
    Get a direct 12v to the fan to see will it spin up.
     
     

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    Like said the fan has continuous voltage and ground. It activates according to PWM signal from engine ECU. Other than activating with diagnostics is quite difficult because you should have a PWM signal processor and you should know the specs for PWM used in this case. There is no relay in this system.

    Quote from WDS: CLICK
     
     

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    Yes,but steveo135 needs to test the fan by giving it a direct 12v by using the red and black wires to see if the fan is actually working.
     
     

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    I hate to sound like a broken record. The fan has brushless (electronic commutator) motor and control electronics inside the fan housing to change the rotation speed according to PWM signal. So you can't test it with direct voltage.
     
     

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    Quote Originally Posted by Clavurion View Post
    I hate to sound like a broken record. The fan has brushless (electronic commutator) motor and control electronics inside the fan housing to change the rotation speed according to PWM signal. So you can't test it with direct voltage.
    You have a PM
     
     

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    Quote Originally Posted by Clavurion View Post
    I hate to sound like a broken record. The fan has brushless (electronic commutator) motor and control electronics inside the fan housing to change the rotation speed according to PWM signal. So you can't test it with direct voltage.
    So are you saying that there is no 12v live wire and no earth wire going to the fan and that the pwm signal does all the work?
     
     

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