I dont know were to start. my heater for the cab, dosent work, after about a hour driving it dose not even get warm. any ideas people

 

Check coolant level first. If that's ok, with the engine nice and warmed up, check temps of the hoses leading to/from the heater core. Hose on passenger side is Hot side. Drivers side is return to the water pump. If the return side is a lot cooler than the feed side, try back flushing the heater core. They like to clog up, or get an air bubble trapped, or both...... which seriously compromises their performance. You should be able to cook yourself right out of the truck.