I most of the time have cold air blowing and my tempture is find on temp gauge. There has only been one day that it blew warm until I shut it off then back to cold my radiatior is full what should I consider next?
i hate to tell you this.
and i hope be wrong.
but i have a 99 jeep grand Cherokee, and last year i got this problem.
just like you said, 1 day it was alright and the next wasn't.
i took my truck to different places and nobody wants to deal with it,
finally when i found a place, they took it to the dealer, and dealer tell them what was wrong with it.
Heater Core problem.
like i said, i hope be wrong because i pay around 800 to get it fix it.