Audi TT Forum banner
1 - 20 of 27 Posts

·
Registered
Joined
·
202 Posts
Discussion Starter · #1 ·
Last weekend I decided to flush out the Radiator and a ton of gunk came out and it is now unblocked. However, when i'm idling or stuck in traffic I noticed that the temperature still rises to beyond 100 degrees and by the time I got home to the drive it was showing 116 on the 49c check.

Popped the bonnet and the fans are not working. Unsure if it is related but the air con does not blow cold either.

At some point in the last month it has stopped working, I know when I first bought the car it worked fine so unsure. Any ideas?
 

·
Administrator
2001 Amulet Red 225 coupe.Owned from new as well as a Nurburg VXR & an XR3, all from new.
Joined
·
97,162 Posts
Hi uzzieman, If aircon is on then 1 fan normally runs, so get fans sorted first. Check fuses & then the fan cut-in switch, 2/3 down rad on passenger side.Will have a look for fuse No.s etc, unless someone beats me to it.
Hoggy. :D
 

·
Registered
Joined
·
644 Posts
Look at the fuses on top of the battery. Think they are 30 amp.

They went on my old A3 1.8TQS and had exactly the same symptoms. The fuse controls fans and aircon.

Jas

Sent from my iPhone using Tapatalk
 

·
Registered
Joined
·
202 Posts
Discussion Starter · #4 ·
Thanks for the replies, will take a peek tomorrow and see what's what!

I am assuming that with the air con on, and the bonnet up one of the fans should be running?
 

·
Registered
Joined
·
185 Posts
I had this issue, if you switch air con on the fan should kick in. The fuse is above the battery and is 30amp the most inner fuse to the engine of the three. Mine had not blow but the connection had become poor so in the end after numberous times of cleaning it i removed the fuse panel and stripped cleaned it and its now ok.
 

·
Registered
Joined
·
202 Posts
Discussion Starter · #6 ·
Had the sensor on the radiator changed, this has made no difference and I took the fuse out from the top panel, cleaned that and put it back in, but doesn't seem to have done anything.

RE the fuses above the battery, is this in reference to the square box thing above the air filter under the strut bar? I lifted this and it had one 4 pin square fuse/relay type thing in it (far left), which didn't look damaged or burnt.

The fuses in the side compartment are also fine.

Tested the radiator fans by direct current from battery and they are working fine. Engine temp on 49C gets to 116 and they still don't kick in, on the dash it's the pin before the red zone.

Any ideas what to check next? I'll buy a replacement fuse for the top just in case, but wanted to check it was the correct area?
 

·
Registered
Joined
·
202 Posts
Discussion Starter · #7 ·
Still baffled on this one, asked around some garages but nobody has a clue other than to get an auto electrician and do some testing.

Had the cam belt changed not long ago, wondering if any part of that procedure would be messing about with the radiator fans, switches or sensors?

That or my steering angle sensor which was also changed, but nothing else.

Does anyone know exactly how the radiator fans operate in terms of what module/sensor flicks the switch on? I'm guessing it's not the actual radiator switch itself as that has been changed.
 

·
Registered
Joined
·
51 Posts
Did you resolve your issue? I have exactly the same problem where my fans don't cut in, either with the aircon or once the temp starts to rise above 100, and the aircon doesn't get cold.

I've found that the inner most fuse of the 3 on top of the battery had some white crud on top of it which I've made a quick attempt to clean for now while I get a replacement fuse tomorrow.

Assuming the fuse doesn't resolve it I just wondered what to try next and whether you'd sorted yours

Cheers,

Wes
 

·
Registered
Joined
·
202 Posts
Discussion Starter · #9 ·
Problem sorted, it was the Fuse on the top of the battery. I actually had an auto electrician come out before I checked anything and he did the 'full works' and said it was the sensor on the radiator.

Took it to a garage to get radiator sensor fitted and it didn't fix the problem. It was then diagnosed as the fan control unit which is under the battery, £120 part. That was fitted and it didn't fix the problem. The thermostat was then changed, radiator flushed and basically after 3 days to no avail I was no better off.

My dad had a problem with his passat which VW had asked for £1000 to fix, so he found a VAG specialist in Wigan who sorted it for £180. They diagnosed it over the phone and it was completely different to what VW had said. Whilst there I spoke to the guy about my car and he said to take the fuses out, give them a good clean and put then back in.

When I got home, I couldn't get the fuse out, had to use pliers. I thought it was a bit odd as the auto eletrician and the garage had said it wasn't the fuses. But to look at they looked fine. I took it out and put it back in several times so the contacts were shiny.

Turn engine, voi la - problem solved. Had the fan control unit changed back to the old one and avoided a nasty bill.

Lesson learnt, if you can, always check yourself! lol :) Hopefully the fuse issue will fix yours! Runs super cold now and temp stays right on 90. Happy Days!
 

·
Registered
Joined
·
51 Posts
well... good news so far...

this morning, tried the removal of fuse 16 just to see if the fans came on and they did

grabbed some replacement fuses on the way home from work tonight and when i got home just quickly tried the aircon on to see if they were coming on then and they did!

so, just need a decent run and then i'll check whether they come on when the temp gets a bit hotter. other than that it seems that just cleaning up the fuse on top of the battery that had some white crud on it did the trick :)

my VAGCOM cable arrived today so i'm off to play with that now!
 

·
Registered
Joined
·
413 Posts
Yep me too...my fuse on top of the battery just looked a bit dirty..gave it a clean and voila :D
This can cause 3 problems (what I know off) 1: fans not working. 2 : air con not working. 3) secondary run on water pump not working.
 

·
Registered
Joined
·
332 Posts
Great thread.

I had aircon but no radiator fan and traffic queues and red traffic lights have been a source of fear for the last couple of weeks! At the weekend I had another look at the fuses after reading this thread. All the 30amp fuses on the right on the battery cover were fine but I took them out and gave them a good clean - though not obviously dirty or tarnished. Then I noticed the middle of the 5 strap fuses to the left of the 30 amp fuses was burnt through. Replaced it and after a minute or so of heart stopping anticipation, with the engine up to temperature and the bonnet up, the fans kicked in, then went off after about 40 seconds, then kicked back in again - job done. No more worries in traffic so far....

Best £2.48 on a genuine Audi part I've spent ! Got to love the forum and TTOC membership follows as a result.

Cheers.
 

·
Registered
Joined
·
7 Posts
Hey ive got the same issue, got 2004 3.2 V6. Overheats when sitting in a jam for more than about 20 mins, then its a case of putting the heater on full blast to draw out the hot air into the cab and out through the windows. Works too but as its about to get hotter not sure this trick will work much longer.

Also since buying mine 8 months ago the Air con blows but not cold and i have to use the econ mode and the old school fans to cool down, again not gonna work in the coming heat !

Therefore i am very interested in the solution put forward here, but when it comes to cars im not the most pratical. So i need help pleez !

1. We are talking about fuses ON the battery ? Ok my Battery is in the boot under all the covers. The only fuses i knew about we on the drivers side down the side of the dash, where u have to open the door to get acess too. Can someone please post a pic or an idiots guide?

2. Ok then once i know where it is i just pull out and clean ?

Thanks in advance cos us TT 's gotta stick together !
Jonny
 

·
Registered
Joined
·
332 Posts
Hi Jonny

The fuses I am describing are in the engine bay where the battery would be in a 1.8

View attachment 3

To the right of the engine there is a plastic trim which needs to be removed. It's held in place by three Philip head screws. Once these are out lift the panel up a little at the rear and pull it away from you and left. The fuse box will then be revealed.

View attachment 2

Press the tabs in at the sides of the fuse box to open, it hinges at the front, to reveal the fuses.

View attachment 1

Check that none of the strip fuses have blown (my middle 40a was burnt through) and remove and clean the contact areas on the three green 30 A fuses on the right of the picture.



Reverse the process and you are good to go.

Hope this helps.

Sorry for the picture quality from my iPhone.
 

·
Registered
Joined
·
7 Posts
Well much to my amazement its worked ! Air con sorted and overheating issues sorted, it was the 30AMP fuse on the right that was blown, but god knows what blew it, im thinking the fan is pulling to much juice and maybe on the way out...but seriuosly thanks for the pictures and well the management in here should make this a sticky cos well u just saved me tons of $'s and im eternally grateful and im sure there must be loads of others with issues like this .

Thanks a lot and im gonna go enjoy a nice drive with my air con on full,go buy me some fuses and enjoy the TT total fridge style !

:p :p :p
 
1 - 20 of 27 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top