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Thread: Blower only works on fastest settings

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  1. Blower only works on fastest settings 
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    1995 Passat 2.0 16v
    Hi

    The blower for de-misting the windscreen, etc has stopped working on the slowest 2 settings. It works fine if I turn it up to the higher speeds.
    Anyone seen this before? Is it likely to be the control knob not making a proper connection, or does the motor have multiple connection points for different speeds?

    Thanks

    Colin
     
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  2. Re: Blower only works on fastest settings 
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    It's a common failure of the variable resistor found mounted to the fan behind the dash in the passenger footwell.

    Not too hard to change IIRC. Hope that helps

    Nick
    1.9 tdi PD 100 Bora
    110cc pitbike, 4 speed semi-auto
    110cc Off road buggy, 4 speed semi-auto
     
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  3. Re: Blower only works on fastest settings 
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    Quote Originally Posted by bora(ing) nick View Post
    It's a common failure of the variable resistor found mounted to the fan behind the dash in the passenger footwell.
    Thanks Nick.
    Presuming it's replaceable, how do I get to it? Will it involve removing the passenger airbag? (Which sounds a bit risky?)
     
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  4. Re: Blower only works on fastest settings 
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    Airbag stays in place....

    If you pop your head under the passenger side dash.... remove trim if necessary, and look for the wires entering the fan.... the wires will enter the resistor before the fan.

    Nick
    1.9 tdi PD 100 Bora
    110cc pitbike, 4 speed semi-auto
    110cc Off road buggy, 4 speed semi-auto
     
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  5. Re: Blower only works on fastest settings 
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    Great, I'll have a look, thanks!
     
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  6. Re: Blower only works on fastest settings 
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    Quote Originally Posted by bora(ing) nick View Post
    It's a common failure of the variable resistor found mounted to the fan behind the dash in the passenger footwell.

    Ok, managed to get the resistor out fairly easily.
    Is it possible to test with a multimeter? I was expecting to see some obvious damage, specially as I occasionally get a water leak dripping on the passenger's feet, but it all looks perfect.
    It's marked R40K, R80K (and something else I can't read).
    Looks like there's a feed going in, 4 wires coming out, one of which seems to be directly connected to the feed (the blower has 4 speeds, so I guess that corresponds, with the directly connected one giving full speed).

    Guess I'll just have to replace it and see ...

    Thanks!

    Colin
     
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  7. Re: Blower only works on fastest settings 
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    I had a similar problem with my old civic, which i think inherited it off Rover, when it was Honda/Rover, i just pulled it out, and there is like insulutation over a ciruliar wire thing, i got a 2nd hand one from the scrappy to check it, and it was and bought a brand new one from Honda at honda prices

    hope that helps

    Quote Originally Posted by tatham View Post
    Ok, managed to get the resistor out fairly easily.
    Is it possible to test with a multimeter? I was expecting to see some obvious damage, specially as I occasionally get a water leak dripping on the passenger's feet, but it all looks perfect.
    It's marked R40K, R80K (and something else I can't read).
    Looks like there's a feed going in, 4 wires coming out, one of which seems to be directly connected to the feed (the blower has 4 speeds, so I guess that corresponds, with the directly connected one giving full speed).

    Guess I'll just have to replace it and see ...

    Thanks!

    Colin
     
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  8. Re: Blower only works on fastest settings 
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    Quote Originally Posted by tatham View Post
    Ok, managed to get the resistor out fairly easily.
    Is it possible to test with a multimeter?

    Anyone have any thoughts about testing? Dunno how much a new one costs, but I like feeling pretty sure that the old one's knackered before buying a replacement ...


    Thanks!
    Colin
     
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  9. Re: Blower only works on fastest settings 
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    Quote Originally Posted by tatham View Post
    Anyone have any thoughts about testing? Dunno how much a new one costs, but I like feeling pretty sure that the old one's knackered before buying a replacement ...


    Thanks!
    Colin

    Just measure the resistance between the in coming feed, and each of the outgoing feeds.

    From what you have said, only 1 of the wires (full load) should give a decent reading.

    The others should be minimal.

    Nick
    1.9 tdi PD 100 Bora
    110cc pitbike, 4 speed semi-auto
    110cc Off road buggy, 4 speed semi-auto
     
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  10. Re: Blower only works on fastest settings 
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    Quote Originally Posted by bora(ing) nick View Post
    Just measure the resistance between the in coming feed, and each of the outgoing feeds.
    Thanks Nick.
    I tried measuring the resistance, and I couldn't get any reading for three of the outgoing feeds, which implied that it's knackered. I just wanted some confirmation that reading the resistance was the right approach, which you've given me, thanks!

    I usually buy parts like these at the local VW dealer, anyone got other suggestions?

    Thanks
    Colin
     
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