climate control issues
 

when i put the temperature high like 70 & up it warms up just fine but when I lower it down to 68 & below it won't cool down. i have to drop it down to the lowest temperature, til it read LO, then it cools down properly & when I adjust to 68 it works just fine. This happen everytime.
My question is it my controller or the AC module that is going wacko?