Hi I have a 5945 and I am expecting my tractor has a leaking headgasket as there is steam comming from breather, but after reading some threads it is possible I might have a leaky frost plug? It uses some water and has no coolant yet as I want to sort this issue first, It starts steaming when it gets to normal temp around 80 degrees. Just putting it out there to see if someone has had same fault????