Thread: Heat related loud noise Td5

Hi Guys,
No ACE so can rule that out.
Once the noise starts it starts and stops but with no particular rhythm or cause until the engine is shut down. Steering doesn't go heavy and winding lock to lock while groan happening doesn't have any effect. I have tried switching a/c on and off, heater from hot to cold etc all with no effect.
Thanks for the ideas though - they all help.
Charlie, going greyer by the day !

if its a manual it might be the dual mass fly wheel
if its an auto it might be a crack in the flex plate
it could be the coupling between the powersteering pump and water pump.

check the flex coupling and the security of the exhuast heat shield

Cheers Dave.
It is auto.
I am wondering if the slight notchiness in the fan bearing is the problem when it gets well heat soaked.
Is there any simple way to diagnose the ps / water pump coupling or does it need to come out?
Cheers, Charlie

Hmm, This is getting beyond what can be diagnosed via the internet. Understand that noises can travel in cars. I think you really need to take it to some1 for a diagnoses .If it is bad that its a worry there could be something about to let you down in a big way!'

Cheers Scott

Tend to agree with schuy1 , however I wouldn't rule out the thermostat , get it to make the noise then carefully with a rag place your hand on it, this would be easier with the fan removed though you may be able to get it from underneath

Originally Posted by Charles

Cheers Dave.
It is auto.
I am wondering if the slight notchiness in the fan bearing is the problem when it gets well heat soaked.
Is there any simple way to diagnose the ps / water pump coupling or does it need to come out?
Cheers, Charlie

unfortunately it needs to come out.

the easy way to test up the fan bearing is to warm it up with a hot air gun, you need to heat it to about 120 deg C and then start the engine, if it makes noise and then quiets then becomes noisey again then its your issue.

Thanks Guys,
Will test fan bearing with heat and consider options.
Cheers, Charlie

When fitted how easily should the fan bearing spin?? Having removed the fan hub I can rotate the flange but if I "spin" it, it stops almost immediately (barely half a rotation). The old bearing spun very, very easily which I assumed was because it was totally knackered.