Just to confirm, if the big fan comes on fast and the little fan never comes on, does all this still apply ?
LCR .. twin fans
- Thread starter supercuprar
- Start date
Does anyone know if the window lights flashing, etc as mentioned above is direct relation to the fan issue?? If this member is still active what was the resolve please??
I'm now slow again!!!
On the last day of my warranty I decided to edge my bets at the Local VW Specialist I use with my Fan Fault and as soon as i said the Problems they said it was just the SMALL fan that was the problem not the other, I said its both, described the pulsing and lack of slow speed when the aircon was on, they said deffo only the small one, rang warranty and they accepted the £235 bill.
I let them do it and had no hope that it would fix the problem, but it does!!
So it looks like only the small one needs replacing and at £235 fitted thays not too bad!
Both fire up slowly as soon as I press the "snow flake" and stay on, no pulsing just pretty much silence!
Jon
Can anyone confirm that its deffiately just the small fan that causes the issue ??
This post seems pretty conclusive..
Going to change mine soon but if i can get away with just the smaller one then
Anyone ?
Also just found this...
http://www.eurocarparts.com/ecp/c/SEAT_Leon_1.8_2005/p/car-parts/car-cooling-parts-and-car-heating/cooling/car-fans/?213440640&1&94ff3d7b226589f5f386668a8f3b29f6cef1d5a1&000128
going to ring them to see wether this is the big or small one. just wondered if anyone has already done this ?
Also just found this...
http://www.eurocarparts.com/ecp/c/SEAT_Leon_1.8_2005/p/car-parts/car-cooling-parts-and-car-heating/cooling/car-fans/?213440640&1&94ff3d7b226589f5f386668a8f3b29f6cef1d5a1&000128
going to ring them to see wether this is the big or small one. just wondered if anyone has already done this ?
Anything is possible, but this is not likely. Read the thread and look at the diagrams. The fans are wired in parallel and should both come on together.
I suppose there might be a way the small fan could fail so as to prevent the large fan from working.
You should test both fans - it's easy enough to do and has been described in this thread. Then you'll know for sure where the failure lies.
I suppose there might be a way the small fan could fail so as to prevent the large fan from working.
You should test both fans - it's easy enough to do and has been described in this thread. Then you'll know for sure where the failure lies.
Sorry muttley I prob wasn't clear...
Both fans do work on high speed (when engine gets hot etc.) but neither work on slow speed like they are supposed to when the a/c is switched on. Therefore the computer pulses the high speed on an off to keep the condensor cool but this is not good for the fans or the fan fuse !
Jonwm said he had this same problem and after having just the small fan replaced at a dealer the problem was solved !
Just wondering if this was deffinately the case as it was long thought that both fans had to be replaced to cure this.
Then my second querey is, is the fan I posted a link to the small of larger of the two fans as that's the only one euro car parts stock. Will be ringing them to find out soon though so will post my findings if no one has beaten me to it by then !
Both fans do work on high speed (when engine gets hot etc.) but neither work on slow speed like they are supposed to when the a/c is switched on. Therefore the computer pulses the high speed on an off to keep the condensor cool but this is not good for the fans or the fan fuse !
Jonwm said he had this same problem and after having just the small fan replaced at a dealer the problem was solved !
Just wondering if this was deffinately the case as it was long thought that both fans had to be replaced to cure this.
Then my second querey is, is the fan I posted a link to the small of larger of the two fans as that's the only one euro car parts stock. Will be ringing them to find out soon though so will post my findings if no one has beaten me to it by then !
Slow speed fan failure is almost always down to the resistor in the fan failing. If the resistor in one fan fails, the other fan should still come on at slow speed.
You can test each fan to see what has failed (if anything). Put 12v across the terminals. The red/black wire is common. It's possible that the fans are OK and the fan control unit has failed.
You can test each fan to see what has failed (if anything). Put 12v across the terminals. The red/black wire is common. It's possible that the fans are OK and the fan control unit has failed.
Hi all about a year ago I had the fan problem that everyone is talking about. Fixed it with a nime kit and has been working fine ever since, until today my 40 fuse on top of battery had blown so no fans but every time I replaced it fuse would blow again after the fan ran for a few seconds. Have checked inline fuse on nime kit and all wires no faults found. The only thing that I found that could be related is there is some kind of electric component connected to the coolant system located at top right of radiator that seemed to be making a lot of noise even with the engine turned off. I have no idea what this is or even if it's causing the problem. So I'm thinking its either this or the nime kit has packed up. Any one have any suggestions and what exactly is that component?
That component is the thermoswitch. It contains two temperature-sensitive switches that close to activate the two fan speeds when the radiator temperature reaches the set points.
Low speed
on: 92...97 °C
off: 84...91 °C
High speed
on: 99...105 °C
off: 91...98 °C
Which fuse is it that keeps blowing? Presumably S164, second from the left, since you say it's a 40 Amp fuse.
Fuse positions are labelled as follows in the electrical diagrams (standing in front of the car, going from left to right), first the flat screwdown metal strip fuses
S162 was not present on my old TDI 110, which is shown in the photo above: it is there on my TDI 150 Sport, which has the three glow plugs in the coolant circuit to get the engine up to temperature quickly and to supply some heat to demist the screen in winter.
The plugin blade fuses are
Two fuses for the radiator fans is correct for cars with airconditioning. Without aircon you should only have the larger fuse, S164.
This diagram shows how the fuses are connected in the standard car
and this one shows how the Nime box fits in to the system
The supply from S164 goes straight into the fan control module. It's possible the fan control module has failed, but I'd check the fans themselves first to see if they have developed a short, but before that, check the thermoswitch - with the engine cold, both switches should be open. there should be no conductivity between any of the pins.
Low speed
on: 92...97 °C
off: 84...91 °C
High speed
on: 99...105 °C
off: 91...98 °C
Which fuse is it that keeps blowing? Presumably S164, second from the left, since you say it's a 40 Amp fuse.
Fuse positions are labelled as follows in the electrical diagrams (standing in front of the car, going from left to right), first the flat screwdown metal strip fuses
Code:
S177 110A Alternator
S176 110A Interior
S164 40A Radiator fan
S163 50A Engine Glow Plugs
S162 50A Coolant Glow Plug HeaterS162 was not present on my old TDI 110, which is shown in the photo above: it is there on my TDI 150 Sport, which has the three glow plugs in the coolant circuit to get the engine up to temperature quickly and to supply some heat to demist the screen in winter.
The plugin blade fuses are
Code:
S180 30A Radiator Fan
S179 30A ABS
S178 30A ABS (pump)Two fuses for the radiator fans is correct for cars with airconditioning. Without aircon you should only have the larger fuse, S164.
This diagram shows how the fuses are connected in the standard car
and this one shows how the Nime box fits in to the system
The supply from S164 goes straight into the fan control module. It's possible the fan control module has failed, but I'd check the fans themselves first to see if they have developed a short, but before that, check the thermoswitch - with the engine cold, both switches should be open. there should be no conductivity between any of the pins.
Hi thanks for the info. Yes you are correct it is the 40 amp radiator fan. As I've got a nime kit fitted doesn't that bypass the control module ? As I understand the diagram (correct me if I'm wrong) there should be 3 wires going to the thermoswitch one feed and two outputs going to low and high speed fans and as water temp rises operates switches sending signal to fans. So if I disconnect the plug and short wires over I should see fans operating and if no fuses blow it points to short in the thermoswitch
No, the Nime box does not bypass the fan control module, it replaces the low speed resistors by a pulse-width modulation circuit. The fan control module has to stay in place: apart from anything else, it has several functions in addition to fan control (Continued coolant circulation pump, compressor magnetic clutch, refrigerant high pressure sensor monitoring). The Nime box is only switched on when low speed fans are required.
Your proposed test should check the thermoswitch: as you say, shorting out the common wire to each of the switch contacts in turn should set off low and high speed fans.
The only hesitation I've got is that S164 doesn't feed the thermoswitch, it feeds the fans via the control module. However your test is still valid, and a good place to start.
Your proposed test should check the thermoswitch: as you say, shorting out the common wire to each of the switch contacts in turn should set off low and high speed fans.
The only hesitation I've got is that S164 doesn't feed the thermoswitch, it feeds the fans via the control module. However your test is still valid, and a good place to start.
Just for info - the in-line 10A fuse connected to my Nime box blew for the 2nd time in quick succession earlier this week. I emailed the guy who builds them and he said using a 13A fuse is safe.
So, I fitted the 13A fuse today - I'll report back
So, I fitted the 13A fuse today - I'll report back
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I'm not sure what's happening - my slow fans have again stopped spinning, and that was with a 13A fuse fitted. What I will do is take the fuse out and test it to see if it is blown.
Have you contacted the guy at Nime to ask?
I have contacted the people at nime and they have never seen that before but have agreed to have a look at the box and maybe repair if they can. The problem is now fan 40 amp fuse still blows after full speed fans kick in but not straight away. I was under the assumption that as long as I don't use my aircon (no need for slow speed fans) everything would be ok.
I would check your wiring too, especially where you've made the connections for the Nime box, for loose connections or stray wires.
I've checked all the wiring and everything seems fine, i've also checked the current across the fuse and it never exceeds 40 amps when fans are running on full speed so i cant figure out why the fuse is blowing. I'm wondering if should just replace both fans for new ones.
dav138
Guest
I've got no slow speed fans at all, no fuses blown, no fans spin when air con is on also.I have put a wire across the Thermoswitch plug both fans spin when fast is connected the fan module clicks and they spin , but nothing at all when connected across slow no clicks nothing! is this the fan control module failure or fans?
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