is there a control for the air mix door behind the glove box how will i know if it is working properly

 

what are codes ac1314&ac1340&ac1347

 

ac1314 - Evaporator inlet temp sensor open - sensor is underhood on refrigerent pipe to inside unit. Displays "SERVICE A/C" on DIC.

ac1340- Air Mix Door #1 movement problem - actuator not moving as commanded

ac1347 Very Low REfrigerent warning - low on freon. Displays "SERVICE A/C" or "LOW REFRIGERENT A/C COMPRESSOR OFF" messages.