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Blower fan

  • 23-04-2020 2:59pm
    #1
    Richard tea
    Registered Users, Registered Users 2 Posts: 3,597 ✭✭✭


    Hello all,


    Ive a 2014 C4 grand picasso 1.6Hdi. The fan blower is not working. It works on the first setting but the speed does not increase after that.



    • I have removed the pollen filters and im awaiting replacements.
    • I removed the fan unit itself and hooked it up to a 12v battery and it spun up to speed no problem.
    • Is it possible to check the resistor with a multimeter? i have read that the resistor can cause issues but normally it sets the fan to full speed and you cannot decrease it.
    • The heating element still works.




    The air con gas needs to be refiled. Is it possible this may cause the issue?


    Any suggestions welcome


Comments

  • #2
    Waterson
    Registered Users, Registered Users 2 Posts: 383 ✭✭Waterson


    Hi OP, to check the resistor properly, you will need access to an oscilloscope, to check the duty cycle of the power feed wire to the blower motor and if said duty cycle increases/decreases with changes in desired fan speed. Alternatively, a resistor is cheap enough and easy to access so swapping it out as a 'throw a part at it' attempt to fix the problem may be worth a try.


  • #3
    Richard tea
    Registered Users, Registered Users 2 Posts: 3,597 ✭✭✭Richard tea


    Waterson wrote: »
    Hi OP, to check the resistor properly, you will need access to an oscilloscope, to check the duty cycle of the power feed wire to the blower motor and if said duty cycle increases/decreases with changes in desired fan speed. Alternatively, a resistor is cheap enough and easy to access so swapping it out as a 'throw a part at it' attempt to fix the problem may be worth a try.

    Yeah I think I'll try that. I think it failed when we had a cold snap in early March. I would imagine the heating was left on full blast whilst doing school runs. I have read that older models were prone to overheating and burning out the ignition wire.


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