Probably the air mix servo has died - the one that control the flap that control the amount of air either going through or bypassing the heater core. I'm not sure if you will be able to remove the motor without pulling out the entire heater/fan/air con assembly (I can't remember if they're 3 piece or 1 piece...).
I think I might have a spare somewhere - I know I pulled apart a JZX100 half cut but I can't remember where I put all the bits
Mos.
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