2001 Ford Windstar speedometer fuse keeps blowing

Find everything that fuse circuit controls, disconnect those circuits one at a time to find which one is causing the fuse to blow. That fuse controls radio--power windows--instrument illumination--cassett player. It is possible the component it self isn't causing the problem, could be wiring circuit.

If there was a new compressor installed, did you plug it in?

There are LOTS of things that can cause an A/C system to just blow hot air. It could be an electrical problem or it could be a hole in the system that is allowing all the freon to leak out. The system needs to be properly diagnosed before anyone can help you.

there is a fuse for your A/C inside your kick panel.

but the issue here is not caused by a blown fuse. here are the probable causes:

1. freon - either your system lacks/leaks freon. have an A/C mechanic refill your freon and have a leak test.
2. compressor is not engaging - when you turn on the switch of your A/C, you should here a 'CLICK' sound in the engine. this means that the compressor (A/C motor) is already doing its job. have an electrician check if the wires are properly installed in your new unit

Now if your working on it or a repair shop,
you will need a wiring diagram or waste
your time doing whatever.

Don't throw fuses at it

Walk down the system components
from the blown fuse,by reading the
schematic.

The overdrive light blinking, possibly is indicating a faullt in the trans. Changing the fuse will do nothing for this. Unsure on AC fault.

A vacuum leak is a normal thing to run across on a windstar the plenum (upper intake ) gaskets are rubber and usually end up having to be replaced. A good indicator is usually missing on one cylinder and a tune up has been done and the coil works fine. You may run around town and find a parts store that will scan your check engine light for free and look for a p0301-06 code, a p0300 is a random miss. First things first scan for you code.

check heater control valve

speed odo is blank and o/d flashes and abs and brake light is on

Likely it has more to do with the door that controlls the airflow. Which should be operated by vacum might check and make sure all thevacum lines are plugged in.

Does the gauge in the car show it warms up?

maybe the heater matrix could be at fault, thats the bit that controls the temperature in the car.