Question about how A/C compressor cycles

I recently had the A/C blow warm air for about ten seconds. This happened a couple of times when I was rolling to a stop on a few hot humid days but very inconsistently. I also noticed that the A/C compressor does not cycle on and off during some periods of very hot weather, it just stays in the "on" state (idle up unless I turn off the A/C). Had it at the dealer (almost out of warranty period!), they said everything checked out normal and this truck will override the A/C when the engine needs max power. I was not towing or carrying any load when it blew warm air, just rolling up to a stop sign or light. So my question is; is it normal for the A/C compressor to stay engaged continuously sometimes. Do you notice the same thing in your truck? All the other cars and trucks I've had seem to cycle on and off about every 5 seconds from what I remember.

Thanks