Located under dash, passenger side, close to center console. The motor that operates the door can be seen using a mirror or, a tight squeeze to look under.
No. 2 in the diagram below.
When mine started blowing hot air, it turned out that the nylon gear that operates the metal rods, one for cold side door, other for warm side, was worn and jamming. Ended up replacing the motor assemby. One bolt, electrical plug and unhook the 2 rods. Would have been easy if there was room to work.
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