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    Quote Originally Posted by edber View Post
    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?
    Like already said the fan has permanent ground and continuously live voltage feed, but the fan doesn't do anything if there's no PWM signal.

    Almost the same analogy is used with interior blower fan. The final stage (hedgehog) gets PWM control from IHKA. The final stage determines the voltage applied to blower fan according to PWM. With the electric cooler fan the final stage is inside the fan housing and the fan motor itself is more sophisticated and complex compared to traditional blower fan motor. So in order to run the cooling fan with direct voltage you would have to take the fan apart and it still would be very difficult to run the motor with electronic commutator with direct voltage.
     
     

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    edber's Car Details
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    I understand what you are saying but with the fan connector disconnected the ecu cant send a pwm signal to prevent the motor from spinning,
    so the fan should spin full speed when 12v and and a earth are applied to the respective wires on the fans connector.
    Ive done it with my own fan and it too gets a pwm signal from the ecu.
     
     

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    Ok folks, tonight I have plugged in the new snap on solus ultra, and have had the fan operated at speed through the code reader. Although still nothing when I turn my air con on, I'm presuming this should come on straight away at the press of the button slowly. I have replaced the sensor in the bottom hose and the temp sensor on the head. Is their anything else I could be missing.

    Thanks Steve
     
     

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    #14
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    The aircon also relies on the pressure switch sensor to activate ,which should be on or near the drying container.
    Also relies on the aircon relay.
     
     

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    Quote Originally Posted by edber View Post
    I understand what you are saying but with the fan connector disconnected the ecu cant send a pwm signal to prevent the motor from spinning,
    so the fan should spin full speed when 12v and and a earth are applied to the respective wires on the fans connector.
    Ive done it with my own fan and it too gets a pwm signal from the ecu.
    So turning the ignition off there's no PWM, because DME/DDE is not powered and the fan runs full speed as it has constant voltage supply. One possible symptom for a faulty PWM controlled fan is that it runs continuously even when igntion is turned off. PWM needs to be between 5-95% for the fan to work. This ensures that it won't run without PWM signal and also not with direct voltage on the PWM line.
     
     

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    #16
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    Quote Originally Posted by Clavurion View Post
    So turning the ignition off there's no PWM, because DME/DDE is not powered and the fan runs full speed as it has constant voltage supply
    Nothing to do with ignition,i meant by unplugging the fan from the car completely and giving it 12v direct but the op was able to make the fan run so it seems its ok anyway.
     
     

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