As it gets a little colder here in NC. I turned my heat on for the first time since I bought my Cruiser ( I have only had in 3-4 months). It don't seem to get hot like heat should be. I just fixed the radiator and flushed it with new coolant. At normal operating Temp. The heat doesn't seem to be warm(Hot) like it should be. The rear heat is a little warmer than the front. What could the problem be and how hard to fix it? Thanks for any help.