I hear the noise from both seats. When I turn them off it does stop. Noise is different from my 03 STS heated seats which make zero noise but then again donot offer cooling feature.
C below from a past poting awhile back>>
"the seats have a module which is basically a heat pump.
depending on the polarity to the module, it will either
create heat or absence of heat (coldness). a fan is used to
circulate the air through ducts. it takes a little time to
produce results. the module is efficient though, 100 watts,
- 7amps at 14 volts.."
I don't think all the XLR seats make noise. In our car, the driver's seat's fan is audible but the passenger seat is not. So when we bring it in, we'll have it looked at. By the way, we have a 2002 Navigator with the hot/cold seats. I'll never buy a car without A/C seats again!