Loose belt - will sound like a screeching noise.
Do you mean the defroster fan? If so yes if it blows the main engine circuit breaker in the fuse block.
You have no wheels. - Geoff
A defective vacuum line can cause a whistling sound when the vehicle is accelerating. A loose belt can also create a high pitched whistle sound.
The most likely cause is a dirty fuel filter that starves the engine.
will the transmission causes my 1999 ford expedition to bog down & sputter when accelerating the 4.6liter engine.
A damaged catalytic converter could cause that.
No, the oil change reminder and the check engine light are unrelated.
This tranny has a the feature of putting itself into "limp" mode when it senses a problem with itself. Limp mode is full-time second gear.
It would be very rare for a P1684 code to turn the light on.
Depending on the extent of the clog, it could cause the engine to lose power under a load or accelerating and in severe cases the engine may not run above an idle. I don't see it causing any one cylinder to missfire.
Most likely a film on the inside of a windshield is caused by an engine coolant leak within the heater core.
There are several things that can cause your 2002 Ford Taurus to hesitate when accelerating. A dirty air filter will cause the problem.