Overheating bora. Fan not working

[Yogiferrari]

Help. Our Bora has been overheating. We were driving in heavy traffic when the temp went so high the alarm came and we stopped immediately. We made it to our destination and found that when we were driving at speed, the temp dropped. When we stopped the fan was not going therefore I am thinking that it is a fan relay problem. Any thoughts? If it is. Where can I get one?
Cheers

[Jmac]

Hi there , where you battery is check inside the black plastic cover , there is fuseable links in there. Most likely one of the 30amp fuses or the holder will be melted/open circuit. Now to fit a new one might fix short term but you may find that 1 or both of the fans are shorting. Normally the test for this is put the AC on and the condensor fans should cut in straight away, if not they will cut in and out on only 1 speed. This is a good indication the fans are gone. Mate 1st thing to do is look in the fuseable link area
Cheers and good luck, worst comes to the worst you can by pass the block connector and make your own
Jmac

[goodfella]

Ironically, this happened to me just 2 weeks ago... took it to VW and got it sorted, but $1200 later! 2 x Fans, fuse and labour.

I had a chronic vibration and bad idle whenever I came to a stop, but fine(ish) when driving.

[Mr Messy]

Ironically, this happened to me just 2 weeks ago... took it to VW and got it sorted, but $1200 later! 2 x Fans, fuse and labour.

Yikes, the poor Boro!

Mine overheated badly once, but it was simply the fuse for the fan. Aircon didn't work at the time either, but it's all good now and fixed for cheap.

Sucks to hear about the fans etc, such a nice car

[04bora]

Hi there , where you battery is check inside the black plastic cover , there is fuseable links in there. Most likely one of the 30amp fuses or the holder will be melted/open circuit. Now to fit a new one might fix short term but you may find that 1 or both of the fans are shorting. Normally the test for this is put the AC on and the condensor fans should cut in straight away, if not they will cut in and out on only 1 speed. This is a good indication the fans are gone. Mate 1st thing to do is look in the fuseable link area
Cheers and good luck, worst comes to the worst you can by pass the block connector and make your own
Jmac

i had the same problem, just the fuse went on the inrush current, its best to replace the fuse link with slow blow, some regular fuses blow out in the large inrush current, bceause the bora's 2 fans are quite strong,
also, they are normal brushed motors, not induction motors so they always temporarily short on startup

[graeme86]

Read this:

http://uk-mkivs.net/forums/t/59897.aspx

Absolute bloody disgraceful design on the part of VW

[WhO]

Sorry to bump an old thread but does anybody know if just one or both fans turn on with the a/c? I've found that with the a/c on my bora only turns on the smaller fan onto low speed untill things obviously heat up when both fans kick in and onto high speed.

[h100vw]

Sorry to bump an old thread but does anybody know if just one or both fans turn on with the a/c? I've found that with the a/c on my bora only turns on the smaller fan onto low speed untill things obviously heat up when both fans kick in and onto high speed.

That would probably be correct.

Gavin

[WhO]

Hmmm had a closer look at the fans today because the car started overheating, looks like the larger fan isn't working at all anymore. If i spin it manually it'll sometimes spin up for brief period then stop.

Anybody recommend anywhere in Adelaide i could get a set of fans?

Cheers,
Robert

[Bora Sport]

Read this:

http://uk-mkivs.net/forums/t/59897.aspx

Absolute bloody disgraceful design on the part of VW

The fans stopped working on my Bora 4Mo some years ago. It got hot when I was going up to Mount Glorious.

I got the above modification done (It cost less than $150.00 as I recall) and I still have the original fans in my car (2001 with 170,000k's) with everything still working as it should.

[h100vw]

Hmmm had a closer look at the fans today because the car started overheating, looks like the larger fan isn't working at all anymore. If i spin it manually it'll sometimes spin up for brief period then stop.

Anybody recommend anywhere in Adelaide i could get a set of fans?

Cheers,
Robert

Tim at Volkstorque or Volksfactory would be my first phonecalls. Just confirm it's not the fan controller near the battery first or the fan switch in the radiator.

Gavin

[WhO]

Well after a bit of fiddling i've got the large fan working properly again... for how long im not sure but i'll check it every day and keep you updated to see how long the fix lasts.

Its a bit crude of a fix but after reading the thread http://forums.tdiclub.com/showthread...hlight=vag-com (excellent excellent source of information) i decided to try a few things before pulling the fans out.

After confirming on my partners bora that both fans should come on together on both low and high speeds i was fairly satisfied that on mine the issue would be with the large fan.

After confirming that the large fan was infact getting voltage thus eliminating anything on the car side i tried tapping the fan whilst it was meant to be running. No dice so i tried pulling at it gently and hey presto it would very gently try to turn. This gave me the impression a brush may be stuck and not contacting the comutator properly or gunk may be in there disrupting the contacts.

Possibly not the greatest idea / fix (but used to worked on R/C cars so i figured worth a shot), i then pumped the fan motor full of wd40 hoping that it might be a sticky brush or some gunk on the comutators. After this the motor still didnt really want to work so enter me firmly but gently hitting it with length of wood. After a good bit gentle persuasion it slowly jumped into life and progressively got stronger and stronger.

The fan now runs strongly on both low and high speeds, i reckon i'll keep the wd40 in there for a lil while to try and clean out the gunk and then i'll pump it full of contact cleaner to clean it up.

A note on wd40 is its non conductive so safe to use around electronics, thus why back in the day i used to use it on remote control servo's if they ingested water.

Hopefully this solves my issues! If not i'll be pulling the fan out and apart to properly diagnose it.

Cheers,
Rob

[Jmac]

Yeah mate thats right its the goods, anyway does sound you have a bad point in your fan at least one anyway, these fans do in fact overheat the fusebox on the battery. The fuse box is the quick fix but in the end its normally the shorting fans thats the issue, i remember tripping over plenty in the VW warranty cupboard
good luck
Jmac

[WhO]

Looks like my issue is only semi fixed. Big fan is working intermittantly, sometimes takes a little flick to get it spinning, when the weather cools down i'll take the fan out and pull it apart, untill then fingers crossed it keeps working!

Edit: definitely not working now, go for a drive and it stops working i guess from the road vibration. If you push it towards the radiator on the shaft it'll run but release pressure and it stops.

I'll pull it out asap and take photos of it all. Anybody know the easiest way to get the fans out? From the bottom i'm guessing?

By any chance do you happen to know what the fans motors are worth Jmac? Might just end up getting a new one if they're not too steep

[WhO]

All Fixed. Pulled it all apart today and ended up finding that two of the brushes were stuck retracted back thus not contacting the commutator. After cleaning everything up and ensuring they slid properly it all worked like a charm

Basic guide of what i did: (no pics yet as i cant post attachments)

1. Put the car up on ramps / with the front in the air. Note if you use ramps take out the 4x T25 torx bolts attaching the splash guards to the front bar off now because to access them its far easier if you can turn the wheels

2. Following the guide here on vwvortex http://forums.vwvortex.com/zerothread?id=2368291
I put the carrier into service position. To remove the thermo's you only need to follow the basic steps, no coolant needs to be drained or anything like that.

3. Unclip the plugs going to the radiator fans, two in total. These come apart fairly easily after you remove them from the holder on the shroud. To remove them from the shroud gently twist them off then they are disconnected by pulling on the release tab whilst gently pulling the halves apart.

4. Undo the 4x T27 torx screws at each corner of the radiator, i found a 3/8 drive ratchet with the torx attachment attached handy for getting into the tight space on the upper screws.

5. With the torx screws out the radiator fans and shroud will be just sitting on the radiator, gently whilst under the car push the front carrier forward about 2 inches, it may be wise to have a helper hold / pull the carrier away or assist at this point just to ensure the carrier doesnt try to fly off! I however supported the carrier with my knees. Once you have gained a bit more clearance move the radiator fan/shroud assembly away from the radiator and manourver the drivers side (smaller fan) down past the a/c lines. The fan / shroud assembly i found is easiest to get out like this dropping it out at an angle drivers side first.

6. With the rad fan / shroud assembly out undo the 3x 10mm nuts holding the inoperational fan to the shroud and take the fan/motor assembly off the shroud.

7. Using a dremel cut the tabs that are bent over the motors backing plate to allow the backing plate to come away from the motor.

8. In my case two of the brushes were stuck retracted, a bit of wd40 later and they were free and sliding just fine.

9. lightly clean up the commutator with fine emery paper to give the bushes a nice new surface to contact

10. clean the whole motor, bushes, windings etc with contact cleaner but try to avoid spraying the bearings.

11. Re-assemble the motor and upon refitting the bearing plate gently clamp it down and then glue it down with either a high temp epoxy resin or as i used Sellys Knead It Metal.

12. Work back from step 6 backwards but dont forget to test the fans operation before putting everything back together. This can be done by
(copied from http://uk-mkivs.net/forums/t/59897.aspx)
Reconnect both fan connectors, if still disconnected, and disconnect the 3 pin connector from the radiator fan thermo switch.
Bridge contact 1 and contact 2 with a short piece of wire, the fans should run at low speed.
Switch on ignition, bridge contact 2 and contact 3 with a short piece of wire, the fans should run at high speed.
Switch off ignition, reconnect thermo switch connector.

To identify the connector pin numbers, hold the connector facing you with connector latching mechanism at 2 o'clock, pin1 is then at 12 o'clock, pin 2 at 4 o'clock and pin 3 at 8 o'clock.

13. If it all works finish off with a nice cold drink... especially when its 43 degrees out!!!