I have a 2014 Cruze LTZ and about 4 days ago my heater went out. The first day I noticed it not working properly it was taking an unusually long amount of time for my car to get warm enough to drive as it was -20some degrees outside. I noticed that it warmed up a little faster when I started driving it. The next day it wasn't blowing warm air out at all, even when I drove it. Today and yesterday I noticed that the engine was making a loud noise when I was either driving it, at a stop, or in park. I have an appointment to get it checked out this coming Monday, but I was wondering if anyone maybe had any ideas as to what's going on? Thanks in advance!