a/c

[oldbird]

Three weeks before we take off from AZ for a six month trip. My new to me 5er a/c's got tested out today. First I pulled the covers up top and cleaned every thing up. Inside I cleaned the intake screens and blew out the thermostat's gently to remove any dust in them. The a/c's worked good but my problem was getting them to regulate at a set temp. Once running they would not turn off at the set temp and the temp keep dropping until I raised the setting way up. The reverse was true also. I believe I gave them plenty of time to adjust. Do you guys think it could be the temp sensors or the controller or what? Thanks!