Hi I'm new here and have a 2002 ram 1500 slt with the 4.7 with 157000 miles on it. I'm having a problem with the heater. The fan is on hi but the air coming out feels like it's on low. I really don't want to take it to a shop and get raped if it's something I can do myself. I like doing all my own work on my truck as I'm sure a lot of others like to. If anyone can help that would be great. Thanks.