Slow fan issue

Alexis27 · Dec 15, 2016

I've now got the slow fan fault problem where the fans only work at high speed when you flick the air con on. In traffic yesterday the temperature went from 90 to 100 and then back again.

I'm working on a fix, but in the meantime can I just check it won't actually overheat because the emergency high speed fan will always kick in? It just gets above 90 because it's lost its ability to run low speed?

Should I keep the air con off so that the fan isn't constantly running at high speed?

mty12345 · Dec 15, 2016

It shouldn't overheat in this weather, the high speed fan should catch it each time. It's probably not great for the engine to run hot for too long, but as long as you're getting it fixed in the next couple of weeks then i'm sure it'll be fine mate.

As for the aircon, if that causes the high speed fan to kick in, then i'd switch it on when you see the temp go above 90 and that way you should catch it before it gets to 100C.

Having the heaters set to the hottest and fastest setting is probably the best way to cool the engine down if things get too hot.

virdi · Dec 16, 2016

This sounds like the very common issue ...where the resistors inside the fans have burnt out.

You can do the resistor mod - like here: http://uk-mkivs.net/topic/4773-fan-problem-poll-synopsis/

and here: http://www.seatcupra.net/forums/showthread.php?t=331943

and here: http://uk-mkivs.net/topic/224371-mk4-golfbora-radiator-fan-fix/

OR

Go for something like this!

http://www.nime.co.uk/hardware/mkIVfans

Alexis27 · Dec 17, 2016

Cheers for that. I've got a mate who's an electrical engineer who's going to sort it

Alexis27 · Mar 16, 2017

Still not sorted this out because of the weather being rubbish (and babies eating up every second of spare time!).

Need to get this sorted now its getting warmer. Quick question - does the Leon have this same cross member as the Golf IV?:

I need to take the bumper off anyway to replace it, so is this location also feasible with the Leon? It seems easier to get to the connectors using this method instead of mounting the plate beneath the battery tray.

If so, does anyone know if the exact same plate would fit? Holes in the same place etc?

DogToothCheck · Mar 26, 2017

How did you get on with your fans?

Alexis27 · Mar 26, 2017

Decided to just do the Nime box in the end. Getting a mate with a soldering iron to fit it on Thursday

DogToothCheck · Mar 26, 2017

Good old mates.
Ask him if he fancies a trip to Norfolk to fix mine haha. I'm hopeless with electrics..

Alexis27 · Mar 30, 2017

Yeah, it turned out a bit fiddly in the end! The tricky part was getting the plug out of the fan module so you could swing the wires out to get to them. Had to unplug the starter motor to help.

Still, all done now. We ended up opening the box and adjusting the modulator to test it - you can switch between hurricane speed and slow speed (although slow speed is actually pretty fast when you don't have anything to compare it to).

Mid operation with one wire stripped:

DogToothCheck · Mar 30, 2017

Happy days.
Taking the plunge with the resistors tomorrow. Keep your fingers crossed..

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Slow fan issue

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DogToothCheck

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