i have a question bout a truck! i drive a 2006 freightliner heritage edition truck and im having problems with the truck idleing and the tri pak heating the truck! is this normal? i have never used a tri pak so i dont know if something is wrong or what. i set the tri pak controls to heat and set the temp for 80 and it only blows hot for few minutes then shuts itself off and i end up freezing the rest of the nite. can anyone help me with this problem?