A/C compressor not coming on

[84dime]

Hey guys, I decided that it is getting hot enough to see if my A/C units even work since I bought it last winter. One of the units fired right up and blows really cold air and works perfect. The other one works good as well but when i switch it from fan mode to A/C mode the compressor doesnt kick on. The fan still blows but it doesnt blow cold A/C air. So what should i check first? I have no experience with A/C so im really not familiar exactly how they work. It is a intertherm sch-13-5AA. Thanks -Josh

[robertglines1]

if you have a remote thermostat ch wires on it for corrosion...if not';   it is probably low freon and a AC guy needs to look at it.ch for any loose or corroded wires...Good luck Bob

[baker4106]

Are you sure compressor is not coming on or just not getting cold?   If system is low on freon the compressor will be quiet and no cooling.