Temp control switch???

I'd say OK for now but it helps prevent the evap from icing up under extreme conditions, IE high humidity, but with moderate OD temps and the fan on lower speed, it can easily ice. Make sure the low pressure switch is operating and wired in.

In a situation where you have low heat load (moderate OD temps) and the blower on "less than high" ANY ice will start to plug the evap airflow, further lowering the evap temp and causing a (literally!!) snowball effect.

The big problem with this is that if the system has a charge that is right on the upward line or maybe slightly overcharged, this low temp situation CAN allow liquid to return to the compressor. Compressors don't like liquid. It tends to bend rods, break pistons, and blow cylinder head gaskets.