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
my 1999 winstar was doing this and it was the blend door
Check #10 on the inside fusebox.See "Related Questions" below for more
The "Related Question" below is an extensive discussion on the 1999-2003 temperature control valve / heater control valve. It is likely the information will be similar to the 1997 / 1998 Windstar
The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.
In addition to the front core in the dash, if the van has the optional rear climate controls there will be a second one back there.See "Related Questions" below for lots more about Windstar heater cores and climate controls
If by "heater box" you're referring to the heater core, we've got you covered with the "Related Questions" below.Be sure to review the questions regarding the blend door and blend door actuator motor - other very popular heating/cooling parts in the Windstar
Spend an extra 20 minutes and take the cowl panels off.With those out of the way, there's tons of room to get at the Windstar heater hoses!See "Related Questions" below for detailed instructions for removing the cowl.
how to drain 1999 windstar
There is no MAP sensor on a 1999 Windstar.
Generally speaking the seats from a 1999 Windstar will fit up to 2003 Windstars.
Sounds like the heater core may be plugged up or the heater damper door is broken. See "Related Questions" below for more
There are 3 primary questions about Windstar heating & cooling problems: * Temperature blend door actuator motor replacement * Heater core replacement * Various causes of 'no heat' problems See "Related Questions" below for links