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Hello and thank you for your question,If you place your hands on both heater hoses out under the hood at the firewall with the engine running and at normal operating temp are both hoses getting nice and hot?
Okay if both hose are getting nice and hot and the air inside is not then you have a problem with the blend door and or the adjustment to it. I would try removing the cable from the plenum and see if you can move the door and see if the heat returns, if it does then try adjusting the cables. If it dose not then the problem is with the door inside of the plenum. See the cable adjustment steps in the link below. Copy and paste the link to your browser to open and view them.https://dl.dropboxusercontent.com/u/104923897/Cable%20adjustment%20Oct%205.pdf
The most likely way to access the door would be to remove the heater core which you should be able to with out removing the whole plenum, See the steps in the link below. With the core out of the way you should be able to access the door.https://dl.dropboxusercontent.com/u/104923897/Heater%20core%20Oct%206.pdf
All incoming air with the blend door closed should be coming through he heater core and if that is the case the heater should be nice and hot providing you have good flow through the heater core. If both hose are nice and hot then you should have good flow.
That should be pretty close, are both hose getting nice and hot at the firewall, usually when you have good coolant flow through the core the hoses will be to hot to hold.
Okay then that is likely your problem, they should be to hot to hold if you want heat in the cab. A bad thermostat or trapped air can cause this type of problem. I think you should take a look at the Thermostat.
Not a problem, post back if need be and we can work from there.
If you close the flap on the top of the box doe the air get hot?
Is this solenoid in the heater hose? Either way in most cases all vacuum to the heater system comes from the control valve. The controller gets its power from the engine intake.
I do not think you are beating a dead horse and I'm going to stick with you till we get you some heat. Let remove the blower motor and see if we can determine which door it is and that will hopefully give some idea where to go next. This is one of those time I wish I could be there to help you get this resolved . Post back when you can and we can work from there and hopefully get you some heat before it gets to damn cold.
See the controller removal steps in the link below,https://dl.dropboxusercontent.com/u/104923897/Control%20Oct%2020.pdf