Compressor Not kicking on when cold out

I am running a viair 380. It is mounted n the bed of my mazda, with the filter remote mounted inside my cab. The past two nights I went out to start my truck and the Comps not kicking on, It has been around 17 boh nights. After it sits and runs a for a few minutes the comp. kicks on, what could be causing it to not come on immediately when I start my truck???

had this same problem before the pressure switchcould be freezing up due to moisture in the tank

Yep that is probably the culprit. does not take much moisture to freeze em up