Is it just mine or does everybody else need cardboard over their radiator in order to have heat in the cab? I'll drive my truck 10 miles or more before the temp. gauge even moves, then i'm allowed a little heat. leave the truck idling with heat on, come back and it's like with the heater on it cools the truck that much more. is there any other issues besides trans cooler?

 

Check your thermostat, I'm gonna guess its stuck open. Mine cools off when it idles, but not to the point where cold air is coming out. I get heat before it reaches 60 (140F) on the gauge. When mine cools off from idling, it might be around 85C on the gauge.