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Have the head gaskets checked and intake manifold gaskets checked for leaks. The 3.4's are known for head and intake leaks! Or a bad thermostat.
The 3.8 GM V6 is prone to blown intake gaskets much more than blown head gaskets. The blown intake gasket causes a loss of coolant which in turn causes overheating and a blown head gasket. The problem exists with most 2000 to 2003 vehicles equipped with the 3.8 Liter V6. There were defects in the upper intake manifold gasket, throttle body nuts, and the throttle body gasket.
Assuming this is a 4.3L engine, the upper intake manifold gasket would be between the upper intake manifold and the lower intake manifold.
Remove the upper intake.
The EGR valve on a 2000 Ford Windstar is located on the intake manifold near the firewall. It is typically located to the left of the main throttle body or slightly lower than the throttle body. On the passenger side it is located on the side of the intake manifold closest to the firewall. On the driver side it is located on the side of the intake manifold closest to the engine.
It is hidden on the intake near where the upper radiator hose attaches.
You have to remove the upper intake manifold.
remove upper intake plenum
The IAC valve is mounted on the upper intake plenum (manifold)
The '99 has more bolts. If you have the lower intake also, you can swap the whole thing. The upper alone wont fit. Intake issues are very common for these cars.
Dex-cool coolant highly corrosive is eating away at gaskets mainly intake manifold gasket.