My 2011 Ford F-150 is having little to no heat in the cabin. Where can I find a manual to help me fix this issue before winter hits? Thanks

 

Until you find a manual to explain the operation of the heating system , you might consider trying the following:

With the engine warmed up (running at least 10 minutes) feel the coolant hoses that go from the engine to the heater at the firewall..
They should feel pretty hot. If not, could be a thermostat staying stuck open.
If they are hot, then there may be a problem with one of the heater system blend doors not working. If you change the settings on the control panel you should feel the direction the doors direct the incoming air.. If that is not happening , you need to have someone that is familiar with the system verify what you found and maybe replace one of the blend door motors.
If that is checked and no signal is getting to the door motors , there may be a problem with the control panel itself.

 

https://diyrepairmanuals.com/product...50/2011-f-150/