It is just a fan for the third row and not connected to second or front rows. So it only blow air (cool) to provide circulation. It has no heater and can’t blow any heated air. Unfortunately when it is 0F out and if you have the 3rd vents on it feels fridgid (which is why on auto even with the...
While running heat in the front & middle only cold air blows out of third row vents. Called for service and they said this shouldn't be the case - just had mobile service here running diagnostics and he confirmed with some remote tech that the 3rd row does not actually have a heater unit only...