Whaley noise after shut down

[rivarama]

Hi all - I have been noticing that the engine of my 550 is making a whale noise after I turn the engine off and it’s hot. No idea what it is, it lasts about 3 second and it is recurring every 10-15sec until the car temperature drops down.
It could be that she is begging me to go for another drive, but I don’t think so.
I captured a video but not sure how to post a video.

 

[spkennyuk]

Is the fan running as normal ? Noisy fan bearing or seized fan is a possible cause.

If the car engine is hot the fan will run on after the ignition is switched off until it drops below the 85/90 degree mark.

 

[Lozzer]

I've had a similar noise under the same circumstances, turned out to be a miniscule coolant leak.

 

[Oneball]

My thoughts would be, radiator fan, coolant leak, heater flap servo, heater valve servo, brake servo vacuum leak (wouldn’t have thought that one or a leak would repeat itself but I’m often wrong)

Try disconnecting the battery and see if it stops it, that’ll tell you if it’s electric or not.

 

[rivarama]

Not the fan as it’s off when I turn the car’s off.
I will try to disconnect the battery and see if that’s electric.
if that’s a leak, where is it likely to be seen?

 

[Oneball]

If there’s a coolant leak it might be difficult to spot as it could just be collecting in the undertray rather than dripping onto the drive.

One more thing I hadn’t thought of is check the radiator cap is on and the seal clean. I took a KTM back to the dealer as it seemed to be loosing coolant from brand new, was just a loose radiator cap, I felt a right wally.

 

[Marco07]

Have you checked to see if you’ve got an aquatic mammal in the boot? Lots of people have reported finding water in the spare wheel well.