Hi all, super excited to have gotten my '23 Defender 110 last week. Have been loving it so far.
However, there have been 2 occasions where I have driven it home from work where after I turn the engine off, there is an extremely loud fan noise that comes on and lasts for about 15-30 seconds. I live in Los Angeles and it's been pretty hot here lately. The commute is only 20 miles . Should I be concerned about this loud noise? Thanks all!

 

Normal - but I've heard it far more on the P300 than the P400 (having driven both now in hot weather). Guessing you have P300 -- curious as to which you have?

 

Ah what a relief, yes it is the P300

 

Yup, P300 90S here, same loud fan noise when shut off and hot temps.

 

The fan was activated to cool down the turbos.

 

The fan is really loud. I was surprised as well. 23 P300 here.

 

I had a loud fan noise, which turned out to be a failing water pump on my Velar. It didn't matter the temp outside, the fan was super loud when it was failing.

 

To reiterate, the fan is for cooling the twin turbos in the p300 so as to prolong the lifespan of the turbos

In the old days, after people drove their car hard and came to a stop, they would let the car idle for a while to let the turbo cool off a bit before shutting down the engine.

Nowadays many modern vehicles that are equipped with turbo have a separate electrical circuitry with thermostat that would turn on the fan to cool down the turbo after the engine is shut off.

 

My MY21 Audi RS6 does this. It runs the cooling system, which the fans are a component of, to run coolant through the the turbos for a period of time. As per above I suspect this is what is happening on the P300.

 

Teslas do something similar for their battery also. I remember it caught me off guard at first as well.