[bigsugedr]

I brought my Escalade(08) into the dealer for a cooled/heated seat issue. The heat wouldn't stay on and the cooled fans wouldn't stay on. They said they replaced the module and all that but it still doesn't work consistently. In fact I think it's worse... The fan kicks on for 2 seconds then immediately turns off. They said "that's because it's cold out" I know that is incorrect information. My question is do these seats even draw from the AC or is it just a fan in the seat? Also when the cooled seats are in use the fan should never turn off until the user turns it off, am I understanding this correctly? They seem to think I don't know what's going on and that's I'm crazy. Am I!?

Thank you

 

[Submariner409]

I believe that your heated/cooled seats use a Peltier module - DC current across the interface creates heat or cold, depending on polarity - and a small fan moves the air across the module heat sink.

You might consider a multi-year subscription, for that car, to www.alldatadiy.com. It's the GM service manuals plus a LOT more.

 

[dsminva]

The heated portion of the seats is conventional heat - IE: it uses electric strips that heat up, similar to the rear window defroster.

The "AC" portion has nothing to do with the air condition system, and as Sub said, is probably a Peltier junction providing moderate thermal cooling. That's why it takes so long for the seat to feel like it's blowing cool air.