When my heater is on and the truck is idling, my heater blows out cold air. When the truck is moving it blows hot air.
is thiss after the truck has warmed up or when u just started it
after it has warmed up
is there a piece of cardboard in the radiator
I had the same problem in my 2006 Nissan Frontier you probably have air in the system,with the truck level open the radiator and make sure that is filled up to the top.try and squeeze the hoses that go to the radiator to make sure any air trapped comes out and fill it up again. it worked for me in my truck
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