MK5 Golf GTI

All Things Mk5 => How to Guides / Troubleshooting => Topic started by: Sie on April 01, 2011, 10:29:00 pm

Title: Rad fans coming on, 30s from start-up??
Post by: Sie on April 01, 2011, 10:29:00 pm: Howdo all

Just wondering if anyone else has had this problem, happens near enough everytime as title says 30s after start up, stay on for about 2-3 mins then go off.

did check for fault codes a while back before i got rid of my vagcom lead, was doing it then, maybe not as much.

Any ideas?? thanks

Sie
Title: Re: Rad fans coming on, 30s from start-up??
Post by: Saint Steve on April 01, 2011, 10:31:32 pm: Is it not your Aircon pump starting up?
Title: Re: Rad fans coming on, 30s from start-up??
Post by: golfecho5 on April 01, 2011, 11:14:26 pm: I get this too, just gave up trying to find a solution. Local VW dealer said it was due to the smaller fan not working properly so I had to replace the both to get to the bottom of it. Then the odd stuff happens, when the car is flashed at the dealer it goes away and I do not get any probs for months - then it comes back. Checked both fans and they both work but still get the fan coming on after startup. Not Air-Con as it's the main Big bugger that starts up.

Is it to do with re-maps - sounds odd but can't put my finger on this one either. Gave up till I saw you mentioned it as apart from being annoying they go off after you get on the run.
Title: Re: Rad fans coming on, 30s from start-up??
Post by: AnilS on April 02, 2011, 06:17:16 am: Ours is the same. :scared:
Title: Re: Rad fans coming on, 30s from start-up??
Post by: alexperkins on April 02, 2011, 08:09:45 pm: If you have the aircon turned on this is a common failure of the speed resistor in the fan as it cant run a low speed, then the condenser rad heats up so hot the fan comes on full blast.
Title: Re: Rad fans coming on, 30s from start-up??
Post by: AnilS on April 02, 2011, 09:48:18 pm: Whats the remedy?
Title: Re: Rad fans coming on, 30s from start-up??
Post by: alexperkins on April 02, 2011, 10:01:39 pm: New fan :signLOL:
Title: Re: Rad fans coming on, 30s from start-up??
Post by: Sie on April 02, 2011, 10:41:17 pm: Thanks for the answer Alex, so does anyone have a part number for the fan frame and price??

Thanks

Sie
Title: Re: Rad fans coming on, 30s from start-up??
Post by: alexperkins on April 02, 2011, 10:42:22 pm: I'll get one tomorrow for you :) what year is yours?
Title: Re: Rad fans coming on, 30s from start-up??
Post by: Sie on April 02, 2011, 10:58:36 pm: 2005, one of the old girls

Thanks

Sie
Title: Re: Rad fans coming on, 30s from start-up??
Post by: Weston on April 02, 2011, 11:55:25 pm: Mine does this in the warmer weather with air con on, couldn't justify the £400+ I was quoted to fix it seeing as everything still works anyway
Title: Re: Rad fans coming on, 30s from start-up??
Post by: AnilS on April 03, 2011, 08:29:31 am: Quote from: alexperkins on April 02, 2011, 10:01:39 pm
New fan :signLOL:

Donut :signLOL: I could have guessed that bit but was hoping it would be a small (cheap) fix. Ours is a 2005 and would also be interested like Sie.

Ours does with A/C on or off. Makes no difference.

Thanks :happy2:
Title: Re: Rad fans coming on, 30s from start-up??
Post by: alexperkins on April 03, 2011, 09:30:06 am: :grin:

On the polos, it was possible in some cases to repair the blown solder joint, but you have to use silver solder due to the amount of heat generated - normal solder just melts again!

Let me find the part number for you...

You should have two fans...therefore can you tell me which one is spinning lol!
Title: Re: Rad fans coming on, 30s from start-up??
Post by: Sie on April 03, 2011, 04:21:52 pm: When looking from the front of the car, the rh one still works and spins, Lh (drivers Side) doesnt.

Thanks

Sie
Title: Re: Rad fans coming on, 30s from start-up??
Post by: AnilS on April 03, 2011, 05:14:24 pm: Quote from: Sie on April 03, 2011, 04:21:52 pm
When looking from the front of the car, the rh one still works and spins, Lh (drivers Side) doesnt.

Thanks

Sie

DITTO. :happy2:
Title: Re: Rad fans coming on, 30s from start-up??
Post by: alexperkins on April 03, 2011, 08:02:28 pm: Leave it with me
Title: Re: Rad fans coming on, 30s from start-up??
Post by: AnilS on April 14, 2011, 05:30:52 pm: Hi Alex, any joy? :smiley:
Title: Re: Rad fans coming on, 30s from start-up??
Post by: alexperkins on April 14, 2011, 05:31:25 pm: Update coming soon!
Title: Re: Rad fans coming on, 30s from start-up??
Post by: QD MBE on April 14, 2011, 08:19:42 pm: The part number depends on the make of fan currently fitted, you can't mix and match. Siemens and Temic are the two makes given in the parts cat.

Fan on AXX engine

1K0 959 455 ET -Siemens (200W/295mm Right).
1K0 959 455 CR -Temic.

1K0 959 455 Dt is 300W/360mm left Siemens
1K0 959 455 CQ is 300W/360mm left Temic

1K0 121 207 BB 9B9 is the actual Cowl.

All the above is not cheap, comes to around £360, 60 for the shroud and 160/140 for the fans.
Title: Re: Rad fans coming on, 30s from start-up??
Post by: alexperkins on April 14, 2011, 08:45:07 pm: Cheers QD I was just about to post a very similar one!
Title: Re: Rad fans coming on, 30s from start-up??
Post by: AMR_450 on April 20, 2011, 01:37:13 pm: Hi all

First post but i have been a lurker for a long while

Thought i would share something from my SEAT days

On my LCR, i had exactly the same issue with the fan resistors burned and the fan running flat out

I used this mod to fix the issue without having to replace the fans

I know its a bit of a fiddle and involves some mechanical know how and cutting of wires but its a cheap fix

Not sure if it's applicable on a MK5 but any info is a help

http://uk-mkivs.net/forums/p/59897/449470.aspx#449470
Title: Re: Rad fans coming on, 30s from start-up??
Post by: AnilS on August 12, 2011, 07:56:58 pm: Well I finally got round to sending the car to my Indy. After diagnostics showed a faulty temp sender, new one was ordered. The odl one was reading randomly and causing the fan to come as a precaution.

£130 (all in) later and so far so good. :happy2: