You have a serious problem with the front suspension and need to get it inspected by a professional "straight-away"!
sounds like your transaxles or transmission It could also be a bad wheel bearing - See "Related Questions" below for more
Windstar mini-vans are front wheel drive.
If the squeeling is coming from the tires, then the problem is most likely a misaligned front end. If the squealing is coming from the engine, then the problem would be in the power steering system.
Its probably the metal wear indicator on your brake pads squealing to let you know that your pads are almost worn out.
YES , the Ford Windstar is a front wheel drive vehicle
A loud clicking sound coming from the front of your car when you are driving straight would be the result of a bad CV joint. This is something that should be checked out right away.
On a 1998 Windstar the vacuum reservoir tank is under the hood in the back left of the engine compartment when standing in front of the vehicle. Mine has a red and black vacuum hose coming out of it.
It's probably under inflated.
check your wheel bearings
Check the belts. The most common cause of squealing is a worn or loose belt on the front of the engine.
A Geo Metro is a front wheel drive vehicle. When a squealing noise occurs when the wheel is turning, it can be an indication of damage to the CV joints.
it is possibly your calipers and or rotors.