AC/ Heater blower not working in 2006 Ford Five hundred?

I was having problems with the heater and a/c in the car not turning off unless I turn the car off. And not being able to turn the fan down as well. No biggie I can live with that. Then the other day I went to use my rear defroster and it wouldn't work. Then all of a sudden nothing will blow out. Whether it's A/c or not. I had auto zone check the fuses and they seem to be all working. Is it the blower motor or could it be other things?

Is a company always made to find a solution to a problem?

For example, Ford made cars in the 1900s as a solution to replace horses. Its now easier to get to where we need to be rather than taking longer.

We can also say that Walmart makes it convenient to go to one place for all our needs at a low price. Rather then going to various places at higher prices.

Is that always the case or can you think of a company that did otherwise?

2001 Ford Crown Victoria Police Interceptor oil leak. What could be wrong?

We went to change the oil and there's oil in the coolant reservoir and there's oil covering all of the pipes and other components under the motor. This is the first time this has ever happened. What possible reasons are there for why this has happened, and what is the worst case scenario cost to fix this?

I just failed the Ohio echeck cause of the NO emissions levels were too high?

I know high levels of NO is caused by overheating in the chambers. I just noticed that my air filter hose elbow has a small crack and can make the fuel mixture a little lean. I just don't want it to be the egr valve

Any solutions or other causes?

Added (1). I HAVE1995 FORD PROBE. AND THE ENGINE LIGHT IS NOT ON So I don't know WHAT THE PROBLEM COULD BE