Hi

When I turn on the seat-heating and gently lean into the backrest (or push against it with my hand, when not sitting in the seat) I can hear a sound similar to when you brush with your finger against a running GPU-fan.
Would anyone please have any info about what is in the backrest? Images or videos of the disassembly, or a schema please...?
(Somehow I assumed there's a fan only *under* the seat cushion.)

Cheers
Jarda