P38Seb said:

So next question..

Any link to the mod.. and can it be used without fully working air con? I have a book symbol I’ve not gotten around to sorting yet and a leak somewhere

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P38Seb said:

Evening all,

In the ever continuing journey with the P38 I’ve got another problem/issue/querk I’m stumped with.

Engine is the 2.5D to help work out.

When the engine is cold, it is unbelievably loud - almost like a beating has gone, but once the engine is warm, almost exactly as the needle hits the middle, the noise stops and it’s just the calm purr of the 6 cylinder.

The noise I can only describe as a woosh/roar and is directly affected by engine RPM, so I doubt it’s gearbox/drivetrain issues.

Anyone able to offer any insight?

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P38Seb said:

So next question..

Any link to the mod.. and can it be used without fully working air con? I have a book symbol I’ve not gotten around to sorting yet and a leak somewhere

Click to expand...

Grrrrrr said:

Sounds like the viscous fan. Take it off and see if it stops. It should roar on startup but usually stops after a minute ir two although it can take until I get to the bottom of the hill in cold weather.

I wouldn't bin it. It is very reliable usually and very good at keeping the engine temperature stable. Worth doing the mod to bring the aircon fans in if the engine temp starts to climb too high like the later models if you have an early car.

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Datatek said:

The viscous fan reliable? You are joking, there are countless tales of woe related to the viscous fan failing. Electric, as used on many modern cars, is more reliable, quicker warm up, gives maximum cooling at low revs in high temperatures when the viscous produces least cooling etc etc.

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norseman said:

Don't want to be contentious but I've always found viscous fans reliable in various cars inc. my '79 2.6 safari & four RRC's.
I had to replace such a unit in my old 5 series BM last year as it wasn't locking up properly during the exceptionally hot summer, but the 'leckey aux. fan kept the car from boiling until the local garage had a time to replace the viscous.

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P38Seb said:

Thanks for all the replies. Datatek has given me his guide to the mod which I’ll be using, seems like a very easy and simple mod to do!

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Datatek said:

You may find unscrewing the viscous fan a challenge, I had to cut one off Don't forget to also remove the fan cowl.

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P38Seb said:

Hopefully it won’t come to that. I’m known at work for fixing a bike puncture with a hammer, so brute force I’m pretty good at.

I was going to ask why the cowling needed to be removed? Does it affect the air flow, or..?

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