There are really only 2 electrical components to the heating system:
From the Windstar OWNERS MANUAL...
1995-1998 Heater control switch & blend door actuator - fuse #21
1999-2003 Front Heater control switch & blend door actuator - fuse #10
1999-2003 Rear Heater control switch & blend door actuator - fuse #8
1999-2003 - FRONT Blower
1999-2003 - REAR Blower
1995-1998 - FRONT Blower
1995-1998 - REAR Blower
See "Related Questions" below for more
In a 1999 Ford Windstar, the heater fuse is typically located in the fuse box under the dashboard on the driver's side. You can access the fuse box by removing the cover, and the specific fuse for the heater is usually labeled on the diagram inside the cover. If you're having trouble locating it, consult the owner's manual for detailed information.
There is one circumstance that involves a fuse for BOTH speedometer and heater - a blown #10 fuse.This is also a very common symptom of a known defect on the Windstar involving a leaking brake sensor.See "Related Questions" and "Related Links" below
heater windstar ford
According to the 2001 Ford Windstar Owner Guide ( fuse # 21 ) is NOT USED in the fuse panel in the passenger compartment
The Onboard Diagnostics Tool or ODBII for the 1999 Ford Windstar does require a fuse which is listed on the fuse chart of the Ford Windstar owners manual.
In a 2002 Ford Windstar : ( # 17 ) is a 20 amp fuse for the cigarette lighter / powerpoint and the Datalink connector
On a 1998 Ford Windstar : ( # 16 / 20 amp )
Heater circuit fault
On a 2003 Ford Windstar fuse ( # 17 ) is a 20 amp fuse for the Datalink Connector , Cigarette lighter / Powerpoint
what the number of the fuse on window 95 windstar diver side
ford windstar fuses for electric windows location and numbers Windstar LX
no no