stupid f*cking car

so im on my way to work the car warms right away
and i begin waiting for it to run hot but it doesnt..
and its idling better than it ever has
and i check the heater now its blowing out hot air again

later that day i was driving it and the air coming from the vents fluctuates from hot to almost cold with a few seconds back and forth
is my water pump kicking on and off on it s way to dead or...

ehhh what a pain in the arse
mike

ps thanx guys