I have a 2002 Dodge Ram 1500 two wheel drive with a 4.7 liter engine its been overheating I replace the whole cooling system. I replaced the condenser cooling fan because its not coming on when the trucks getting hot. It comes on when I turn the AC on. I replaced the relays also still not working I am getting know fault codes no check engine light the only other thing I could think it could be is the computer