The radiator cooling fans are turned on when the heater control is set to defrost.
This makes for better and more effective defrosting of the windshield
Follow the LOWER radiator hose from the radiator . It connects to the water pump on the engine on a 1998 Ford Windstar
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
repair the heater hose.
replace the thermostat which is located in the housing that the top radiator hose attches to the engine With my car, it was Heater matrix clogged with radiator sealant. The workshop cleaned it and it's start working fine!
A Chevrolet Dealership
The block heater plug in on a 1998 Ford Windstar is in the engine compartment on the passenger side of the vehicle. When lifting up the hood, look on the left for a small hose that is coiled up at the very front, above the passenger headlamp. The block heater itself is plugged into the front of the motor on the passenger side.
To remove a water pump from a 1998 Ford Windstar 3.0, you will need a tool called a tensioner. Disconnect the radiator and water hoses, then remove the water pump assembly.
Maybe it's bad. Have you tried changing it? Sound logical to me.
My heater doesn't go cold. But to answer your question, check the engine coolant level in the radiator. Be sure that the engine is cold before removing the radiator cap. --Ken
Temperature is controlled via an electric actuator motor.See "Related Questions" below for more all about Windstar rear heating / cooling systems.
Replace freeze plug in a 1998 ford windstar ?
Not likely - the 1999 Windstar was a rather significant updating of design compared to 1995-1998 models.