ALL OF THE ABOVE - APEX
its happen because heater core have too much durt insaide and you can clean it with some blowing thing or replace
becose ther is in said the pepsi so much sugar and no wan likes to drink sugar and ther in so much gas insaide that they can eat your bowns
You will find the tube that drains the pan under the evaporator is clogged . You can clear this problem yourself by checking the tube to make sure it is clear . The tube is under the hood sticking out of the fire wall about midway . Simply take a clothes hanger and poke up it , be careful not to tear the rubber or get a faceful of water when it is cleared . It is a black tube and hangs down , looks like a vaccuum tube from the insaide of the cab .