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[Pitchfork]

Following the Sage advice from TB I have removed my Viscous Fan which was permanently engaged.
Normal running temperature with it on was 92.5, now its 95 (but a lot quieter)
In addition when I stop, the radiator & intercooler fans run on (I did not get that before)
I understand that the 2 radiator fans & the intercooler are switched on by the ECU. My question is: are they on the same circuit or separate ones, because if I was to switch the intercooler on manually (as has been suggested on the forum), if on the same circuit, it would switch on the radiator fans at the same time wouldn't it?

[Seth]

I'm sure it's possible to connect the intercooler fan so that it runs independently of the rad fans.
Depends on where you 'break into' the wiring loom. Anyone .... ?

[Omegatoy]

Following the Sage advice from TB I have removed my Viscous Fan which was permanently engaged.
Normal running temperature with it on was 92.5, now its 95 (but a lot quieter)
In addition when I stop, the radiator & intercooler fans run on (I did not get that before)
I understand that the 2 radiator fans & the intercooler are switched on by the ECU. My question is: are they on the same circuit or separate ones, because if I was to switch the intercooler on manually (as has been suggested on the forum), if on the same circuit, it would switch on the radiator fans at the same time wouldn't it?

not if you run seperate wire as i have to the i.c. fan, TB suggested this may happen if using existing circuits!!!

[TheBoy]

Following the Sage advice from TB I have removed my Viscous Fan which was permanently engaged.
Normal running temperature with it on was 92.5, now its 95 (but a lot quieter)
In addition when I stop, the radiator & intercooler fans run on (I did not get that before)
I understand that the 2 radiator fans & the intercooler are switched on by the ECU. My question is: are they on the same circuit or separate ones, because if I was to switch the intercooler on manually (as has been suggested on the forum), if on the same circuit, it would switch on the radiator fans at the same time wouldn't it?

Not ecu controlled, simply from fan switches in rad.

I remember looking at wiring diagram to manually control i/c fan, and remembering it looked simple enough to do, so just dig out wiring diags (haynes covers wiring for TDs)

[Spearmint]

Right then, my next job will be to sort a switch out for the intercooler fan and replace the seized rad fan.

I think I'll be best to replace the rad anyhow as the symptoms are as if the rad just isn't big enough.

Put it this way. Car behaved itself with it being sat at 80'c no matter how hard she was pushed. I go away for 4 months spotting penguins and she first nearly overheats but with a good flush she doesn't overheat but she does run to warm.

As if some of the rad is still blocked?

[Seth]

Right then, my next job will be to sort a switch out for the intercooler fan and replace the seized rad fan.

I think I'll be best to replace the rad anyhow as the symptoms are as if the rad just isn't big enough.

Put it this way. Car behaved itself with it being sat at 80'c no matter how hard she was pushed. I go away for 4 months spotting penguins and she first nearly overheats but with a good flush she doesn't overheat but she does run to warm.

As if some of the rad is still blocked?

When I've got a chance, I'm looking at removing the air-con rad from mine, basically to see if a full flow of air makes any difference. (We never use the air-con anyway!).
Everything else has been done to it, so other than a bigger rad, (which I reckon 2.5TDs really need), I've run out of options with this 'getting too hot' mullarkey!

[Pitchfork]

Right then, my next job will be to sort a switch out for the intercooler fan and replace the seized rad fan.

I think I'll be best to replace the rad anyhow as the symptoms are as if the rad just isn't big enough.

Put it this way. Car behaved itself with it being sat at 80'c no matter how hard she was pushed. I go away for 4 months spotting penguins and she first nearly overheats but with a good flush she doesn't overheat but she does run to warm.

As if some of the rad is still blocked?

What size brush did you use & what colour were the spots?
Assume you used gloss paint given that Penguins tend to get a bit wet & Emulsion would not last

[chartz]

Hi,

The intercooler fan and the aircon fans all work together, there's nothing you can do about it!

About the aircon radiator, it can be really badly obstructed with all sorts of bugs you know, but anyway it's always seemed absurd to me that a radiator could be in front of another one...

As for  the b****y viscous fan clutch, I now think you can't really do without. I've seen my temp gauge reach more than 100°C without it, really frightening isn't it, but it never passes the 92.5 limit with it.
But then I live in France, and I spend some of my summer holiday in the deep south!

I'm on my fourth defective new viscous: I have to run it at 3000 rpm for a few seconds to disengage it every day. But it does remain silent for the rest of the day!

[Spearmint]

New rad ordered (£191 inc VAT!  ) so we'll see if that makes a difference or not.

[TheBoy]

Hi,

The intercooler fan and the aircon fans all work together, there's nothing you can do about it!

About the aircon radiator, it can be really badly obstructed with all sorts of bugs you know, but anyway it's always seemed absurd to me that a radiator could be in front of another one...

As for  the be ****y viscous fan clutch, I now think you can't really do without. I've seen my temp gauge reach more than 100°C without it, really frightening isn't it, but it never passes the 92.5 limit with it.
But then I live in France, and I spend some of my summer holiday in the deep south!

I'm on my fourth defective new viscous: I have to run it at 3000 rpm for a few seconds to disengage it every day. But it does remain silent for the rest of the day!

easily modified

[Spearmint]

'New' rad turned up from a company called 'Applied Radiators' and they are taking it back as well as it's turned up with a few too many dinks on it with two large fresh cuts in the bottom and top sections.