Never used to do this but now it does, engine not running, checking blend motors with the nano and that fan runs continuously while I'm plugged in.
Weird. It's not the ac fan. No faults logged, in fact, for the first time in 3 yrs ownership EVERYTHING works as it should lol! Just curious as it's never done it before.
Having searched the ETM in RAVE, it doesn't appear to even mention the oil cooler fan on the diesel. I would suspect it is simply turned on by the temperature switch on the side of the cooler so will have a power feed, the switch and the fan with nothing else involved. Where it gets it's power and earth from is anyone's guess. I know people have had trouble finding the part number for the switch though as even the parts listing seems to ignore it.
There must be a bit more to it than just a switch and fan if the act of plugging in the Nano triggers it to come on?
Possibly a relay being driven by the Becm, but as nothing is shown in ETM, this is a real odd one.
Have they re purposed a circuit on the the Becm power board that would do something else if it was a petrol engine??
Later version of RAVE does mention it:
Gearbox Oil Cooler – Diesel
The gearbox cooling process relies mainly on ram air
entering through an aperture in the LH side of the bumper
moulding and is dispersed over the oil cooler. The cooled
oil is fed back to the automatic gearbox via the return pipe,
which is located parallel to the feed pipe on the LH side on
the automatic gearbox.
A small electric fan is fitted to the front of the oil cooler to
cool the gearbox oil during long periods of elevated
gearbox oil temperatures i.e. during extended idle in drive
or low speed towing. A gearbox oil temperature switch is
fitted adjacent to the warning light switch on the oil cooler.
This switch monitors the gearbox oil temperature. When
the gearbox oil temperature reaches 95C ± 3C the
switch provides the ground for the oil cooler relay located in
the engine compartment fusebox.
The relay receives a power supply on pin 86 from shorting
link 8 (J792) in the engine compartment fusebox. The
ground for the relay pin 85 is provided through the gearbox
oil temperature switch. The relay therefore will not energise
unless the gearbox oil temperature switch reaches its
defined limit of 95C ± 3C.
A separate power supply is connected to the relay pin 30
from fuse F28 (30A). When the gearbox oil temperature
switch energises the relay, power is routed via relay pin 87
to the electric fan located on the front of the oil cooler.
As gearbox oil temperature decreases the oil temperature
switch deactivates the relay by breaking the relay coil
ground circuit. As the ground circuit for the relay is
interrupted, the power supply is disconnected.
The ground for both the gearbox oil temperature switch
and the electric fan is via a ground point (E0557).
Interesting.
Thanks for the information.
Sounds pretty darned analog to me!
And you say it comes on and runs when you simply plug in nano?
Earth fault?
P-38 mystery!!