The heat is provided by radiator coolant circulating through the heater core. This is a mechanical process and no fuses are involved. There are fuses for the control panel and the blower motor and the system will appear "dead" if the fuses are blown.
If the problem is lack of heat or control over the temperature of the system, the problem is most likely a mechanical failure of the blend door. This door regulates how much air is diverted through the heater core, and is a common failure on the Explorer. HeaterTreater has developed an inexpensive fix for the problem. Follow my user name to my bio page where you can get pointers to the fix and technical information on how to diagnose the problem and repair it. ford4me
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where is the cam shaft position sensor on a 98 ford explorer 4x4 4.0 sohc 4x4
On a 1999 Ford Explorer Sport , 4.0 liter SOHC : No , " regular " unleaded gasoline , 87 octane is recommended
The 2008 Ford Explorer has single overhead cam (SOHC).
The 2007 Ford Explorer has single overhead cam (SOHC).
The 2001 Ford Explorer has single overhead cam (SOHC).
The 2002 Ford Explorer has single overhead cam (SOHC).
The 2004 Ford Explorer has single overhead cam (SOHC).
The 2003 Ford Explorer has single overhead cam (SOHC).
The 2006 Ford Explorer has single overhead cam (SOHC).
The 2010 Ford Explorer has single overhead cam (SOHC).
The 2009 Ford Explorer has single overhead cam (SOHC).