More issues

[Beerdead]

Suddenly the motor is very loud. An almost roaring whine.

No idea why!!! It has not been touched.

[~Rich~]

At a cold start?
DISCO3.CO.UK - View topic - [Mechanical] [Solved] Roaring Noise from Cold (http://www.disco3.co.uk/forum/topic112.html)
DISCO3.CO.UK - View topic - Engine Noise From Cold (http://www.disco3.co.uk/forum/topic94302.html)
Normal!

[Redback]

Our D4 does it also(same engine) although not as bad as the D3 or our old TD5;)

Baz.

[Beerdead]

Thanks for the replies gentlemen, but it does not diminish as the motor warms. It only occurs under positive throttle, or coasting downhill.

[Redback]

Thanks for the replies gentlemen, but it does not diminish as the motor warms. It only occurs under positive throttle, or coasting downhill.

Have the viscous fan looked at!!

Baz.

[scarry]

The fan is actually electric,not viscous..At first start when cold,under acceleration it will roar,then drop off and only come on when needed.

Could be a fault with the ECU causing it to be on all the time.

[discojools]

Is it electric? I was sure it was viscous. I'll have a look in the morning.

[Marmoset]

The Manual describes it as follows in the cooling specification section:

"Engine driven, viscous coupled with electronic control"

[Scary]

Money would be on the Alternator on its way out.

Lower voltage makes the fan run constantly. Easily misdiagnosed until the alternator gives up

[Beerdead]

Took the bash plates off for a look. Found what appears to be a new leak from the intercooler connecting hoses. Don't know if this is significant or even relevant. Tightened up the clamps
Couldn't see anything else, and couldn't locate the source of the roar, but it didn't seem as loud today.

[bbyer]

I regard the fan unit as what I call an electro viscous fan; I also had to replace mine or at least did replace mine.

The fan is what I call expensive, $632.00 just for the part, but it had sort of locked on, which is of course the desired failure mode.

Incidentally, per a previous post, I am now not convinced that the fan was the problem as the alternator later was also replaced.

At the time however, after replacement, the fan noise problem did go away.

And yes, upon startup on a cold morning, there is still routinely the roaring sound for a couple of minutes, then quiet. You get used to it.

Should I again have the fan noise problem, I will spend more time investigating the state of the alternator and electrical system before replacing the fan regardless of what the dealer LR computer codes indicate.