I have seen many reasons why there is no heat in a cab. You have suggested a main theme..heater core...Drain some of your system and save the coolant,then disconnect both hoses,rig up a connector and hook a garden hose up..flush the core,then switch hoses and flush it the other way,then hook it up. The winter front may be a problem and your thermostat might be the problem,but I'll guarantee one of those three senarios...and theres one more...air in the heater core,I've encountered that as well.Some vehicles have a bleeder in the hose from the water pump and its simple to open and wait until coolant is coming out. You can buy a little valve and install it with two hose clamps into your heater hose and have a bleeder. If I had to bet five bucks on what it is I would say Thermostat....but its easier to check for air in the heater core than pulling out a thermostat when you are not sure. The absence of a winter front shouldn't be a real big factor here if the thermostat is doing its job..it shouldn't open until 180*,you can put a 190* in..sound like an afternoon in the shop checking out these ideas(mine and other posters) The shop I worked in had these issues come in all the time..plugged core needs flushing,air in system,thermostat gone wild...Good luck and let us know how you make out!
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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