dekidex

There was like 40 celsius today here in Switzerland...crazy.
After a while of driving,i noticed that there was a sound coming from the rear,where the speakers are.Sound like a Fan turned on...then i climbed in the back to inspect and yes it looks like some kind of a Fan kicked in.
What could this be?Is it maybe a Battery fan?do we have something like that in our Hybrids???

neurocity

iTrader: (17)

Yes there is a fan system back there. Totally normal. I've heard mine twice now.

Here is a pic, so you don't have to rip apart your trunk. (Took this when installing my XM unit.)
Fan is the Champagne looking unit on top of the battery to the right.

dekidex

wow thanx for the pic.and the explenation.
Why do you think it comes on?Is that fan part of the ML sound system or part of the battery unit?

neurocity

iTrader: (17)

Battery. ML amp is back of the car pass side under the trunk floor cover. The battery gets hot. Its just another safety cool down precaution. Both times when mine went on... it was hot as hell out.

dekidex

Ok,i see.
That is crazy how it never came on until today.And it was even hotter like a month ago down in Greece.

Thanx!

diagtime

the fan runs quite a lot. it has different speeds. you must have heard it on its high speed. it will happen more often with the a/c on recirculate. Same reason why it's recommended to turn the smog sensor sensitivity setting down to level 2 of 7 unless you're particularly sensitive to smog. outside air a/c operation helps keep the battery cool. keeping the battery cool keeps the battery alive.

of course there are many factors that cause battery heat.

dekidex

Thank You