So today i was driving my truck and turned on my Heat inside the cab and i noticed that my ac compressor would click on and spin for couple of seconds and then would stop what could it be that's doing it.Other question is that my breather tube shows white steamy smoke no oil or nothing and i took my oil fill cap off and put it back on the oil fill and it did not bounce or nothing is that normal for the 12 valves thanks.

 

AC is low on charge, and normal on the crank case steam... Get it recharged and you'll be good.

 

If you have it on defrost your AC compressor will cycle on and off