1998 century air problem

[kz94b5]

1998 buick century--always blows hot no matter how low the temperature is set--ac or vent makes no difference--as if inside cabin temperature sensor is broken/giving bad data

[HotZ28]

Is the compressor running and if so, have you checked the low & high side pressure?

[kz94b5]

haven't checked compressor---blows hot even in 'vent' mode which should bypass compressor and use outside air only

[noimaD]

SOunds like the trap door isn't shuting to or opening to control from where the air flows ( heater core ,,, or AC evaporator )