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Thread: renault 5 heater fan

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    renault 5 heater fan

    The fan works when i connect it up to the battery. The switch looks ok after pulling it apart. I don't know if there is any power to it tho. The two terminals in the engine bay (the fan connects to) i can't get any power at all from. Any ideas? Wiring diagrams?

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    Re: renault 5 heater fan

    I'm now getting power to the switch and 12, 12, 12, and 0 volts across the terminals in the engine bay at the three switch positions for fan speeds and off. Rheostat? If it is how much hassle is it to change it 'cos i think its below the shroud for the fan and really hard to get to if so.

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    Re: renault 5 heater fan

    err yes the rheosat, quite a common failure on older renaults, cant remember where it is on the 5, but they have to be mounted in a cool airspreem, and are most commonly fitted in the heater trunking so they are cooled by the heater fan itself, i've never found them too much trouble to remove.

    what usually fails is a capaciter of some sort, i usually just solder a bridging wire across it and it works normally again with no side effects

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    Re: renault 5 heater fan

    Mmm. The fan and assorted bits can all be removed in about five minutes with no tools. All clips and finger tight fasteners. The bit i can't get is in the plastic cage which protects the heater matrix. The rheostat, if it's what i think it is, is fixed in the airflow under the cage in the shrouding for the heater. Ah well. Drive with the window open this winter. Bugger.

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    Re: renault 5 heater fan

    Ok. Heater fan is sorted. A new problem has arisen.
    When i am running straight or turning right there is a grumble that gets louder at speed (vehicle NOT engine).
    I've also noticed uneven wear on the left tyre.
    I thought maybe tracking but the car isn't pulling to either side.
    Ideas?

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    Re: renault 5 heater fan

    No play in the wheel when resting on the ground but it's raining now so i can't really tell.

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    Re: renault 5 heater fan

    It may be the drive shaft on its way out. I had it happen to me a few weeks ago on my citroen zx. The inner joint failed completely in the end. I ended up replacing a drive shaft. It doesn't rumble any more. did 400 miles last weekend in it and it went like a dream. It had been making grinding noises on either lock but fine in straight line, then it got to the point where the joint was collapsing, and the shaft locked up solid on the offside. The inner cv joint was totally knackered. Try listening to it with the window open on either lock and see if its more noticeable than in straight line.
    Last edited by mark87; 09-02-2007 at 06:01.

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    Re: renault 5 heater fan

    Sorted the wheel bearing and fitted a new tyre. Also the stereo! Horray. This is a bitch of a job but i've nearly got the speakers sorted. New mats fitted as well. Another rattle has started but i think i can solve it. I also re-fitted all the trim. Found the missing clips IN the door panels. Damn my mates are a bunch of cowboy bodgers. That solved one buzzing noise behind the driver.

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    Re: renault 5 heater fan

    Quote Originally Posted by bluevauxhallnova View Post
    Ok. Heater fan is sorted. A new problem has arisen.
    When i am running straight or turning right there is a grumble that gets louder at speed (vehicle NOT engine).
    I've also noticed uneven wear on the left tyre.
    I thought maybe tracking but the car isn't pulling to either side.
    Ideas?

    Hi there... I know this was quite a long time ago... how did you remove/repair the rheostat?

    Thanks,

    Shay

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    Re: renault 5 heater fan

    Quote Originally Posted by Graham View Post
    err yes the rheosat, quite a common failure on older renaults, cant remember where it is on the 5, but they have to be mounted in a cool airspreem, and are most commonly fitted in the heater trunking so they are cooled by the heater fan itself, i've never found them too much trouble to remove.

    what usually fails is a capaciter of some sort, i usually just solder a bridging wire across it and it works normally again with no side effects
    Hi Graham,

    I was hoping you could help me... I'm having the exact same problem where I think it's the Rheostat.

    Do you know how to gain access to it?

    Thanks :-)

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    Re: renault 5 heater fan

    One thing you could try is to remove the fan and clean the contact terminals (if you can get to them) and refit the fan.
    I tested it by connecting it directly to the battery and it span up fine.
    It was easy to remove, but a bit of a sod to line it up with the terminals when refitting in that the fan isn't 'guided' in. So even if you've 'fixed' the problem with cleaning the terminals and reassembly you have to get the fan in the correct orientation for it to work. Trial and error by rotating it a few degrees at a time (the fan motor assembly, not the blades, obviously)
    I can't remember if i replaced the rheostat or bypassed it tbh. It might not even have been the problem in the end. But once it was working it was fine, all speeds etc.

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    Re: renault 5 heater fan

    Thanks for getting back to me. I've done all of the above... took out the fan and it tested fine direct to battery, reseated the connecting pins etc.

    I'm thinking it may be the rheostat / resistor pack since I had my meter on the pins in the fan housing/grill...I was getting a perfect 12V no-mater where the selector switch was. Then I made 2 leads for the motor and touched these leads on to the same terminals my meter was... and the voltage dropped to zero volts. Its like when the fan wants the current... its not being allowed to get it and the voltage drops?

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    Re: renault 5 heater fan

    I'm fairly sure the voltage doesn't change across the switch as the supply voltage to the rheostat is the same (i.e. 12v).
    The current from the rheostat is what makes the fan spin at different speeds depending on the resistance, so if you bypass the rheostat is will always spin at max speed in any 'on' position. Sorry i can be any more help. I'm fairly sure i didn't fit a new one, just cleaned up the contacts on the old one, but i did do a lot of work on my 5.

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    Re: renault 5 heater fan

    Oh and connecting leads to the terminals might create too much resistance for the fan to spin, so unless the fan is connected directly i'm fairly sure that this test won't work either way (unless you use thick cable).

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