vegashc110

yeah thats correct colours and all seems to be right, think im going to bench test my spare fans and see what voltage will turn them on then get car upto good temp and see what mine is producing. Thanks for the replies Wino

So got around to checking the CTS (thermostat side - switch side) with multimeter and got the following Normal operation?, seems to lower as temp builds and once Thermostat opens ( cooler fluid from rad passes) shoots up then lowers again as temp rises through full system. Car was just standing as i had multimeter plugged to sensor so couldn't drive it. Next I went to see what power was going to fans 1. Earth 2. 12v battery 3.? 4.? I'm guessing one of 3 and 4 is switch for Radiator fan and other is AC fan switch. I've googled a little but unable to find any wire schematics to confirm. so the following shows what i got: IG off IG on IG+AC on 1+2 13v 14.2 14.2 1+3 0.33 14.2 14.1 1+4 0 0.08-0.30 0.1-0.30 Car was still warm from earlier (temp above 60°c but not at a temp to activate fans normally??) - AC in cabin doesnt cool at the moment so no change when switching between on/off! between 1+4 meter showed a constant flux between those values?? Does this shed any light on where a problem might lie, Does anyone know what values we get in a normal operation when fans work correctly? thanks in advance..

Yeah. May not be the cts feed. But it's the second brand new one in 6 months so small chance I've had one break and two dud new ones (bought from eurocar parts and other from skoda). At least the feed I got rules out thermostat playing up.

I'm unsure where the data comes from as it's a basic plug in tool and doesn't have anything in the manual.

They were off another car I stripped down for spares. They did work on the old car as normal.

havent got access to vagcom but my old mpg reader shows coolant temp as 94-96 once warmed up and sat. Guess that rules out thermostat playing up?

Cheers I'll have to check the temperature the sensor is picking up first. Car has a/c I don't get any fan action when switching on and the a/c isn't that cool but does de-mist on cold mornings albeit slower than it used to. Maybe needs a top up but I hadn't got around to it as I rarely use it.

These photos are from the original fan that was on the car and is identical to what is on now.

I think the thermostat is okay. Temp gauge rises to 90 and never moves. Doesn't struggle to get there and never gone over. Yeah maybe when unplugged its like an overcautious state. At least I know fan works and power gets to it. It's why I was thinking control unit, hopefully an easy swap out fix. I'll have a look at the wires soon and let you know. Thanks.

2010 Octavia 140 bkd So for a while I've noticed my radiator fan doesn't come on and yesterday replaced the coolant flange sensor switch (on the right of the head) to no avail. However when I disconnect this wiring the fan (larger) starts and cycles fast and slow speeds. Connect the switch again and nothing happens (car had been out was hot/running and no kick in of the fan). I have previously replaced the fans themselves. The smaller a/c fan hasn't run at all as far as I can tell. also where is the fan control unit located? thanks in advance.

Dads octavia I 's gearbox has gone need a replacement its a fmh box and an asz engine code. Does anyone know which boxes are a direct replacement (other than an fmh) Thanks in advance

So this is the turbo pipe on the egr side as it leaves turbo to go to intercooler this is the second union after the turbo on the egr side thing I notice about most turbo issue pictures is the carbon build up always seems dry, mine seems wet?

Well after using different cleaners including turbo and catalytic that go in the tank I haven't had any change. I used a egr cleaner which you spray directly into the air intake in front of the air filter box (after removing the filter), so it travels though the turbo too, and that seemed to improve things for a day or so. I have since bought an Innotec turbo cleaner and used that yesterday. There is build up on the blades inside the turbo and this loosened some of it (can't see vanes without dismantling) took for a run, got some dirt to come out the exhaust at first, however car still had its loss of power at the top end. After driving it about today I would say it feels better than it did but I think further cleaning, maybe a terraclean type might be next. The only other concern I have at the moment is that I think it maybe an oil seal inside the turbo as the aluminium side of the turbo is wet around the air pipe connections. I'll post the pic later to see what people think.

It certainly is, with such a drastic loss of power you would expect it to throw something up.