Ac use to work fine up until now. I don't know if its a fuse or what. Where is the ac fuse located at, in a 97 crown vick

I recently had my engine replaced in my 2002 grand marquis 4.6 with a 2009 crown Vic 5.4 engine and was running fine until I broke my ignition and tried to replace it myself I bought a new ignition switch didn't work so I bought a steering column and still won't start what do I d?
I landed on this website reliable-store.com and they got me free manuals so I used it to repair and it works fine

Check the fuses

Check your brake light fuses

It's most likely a fuse. Check your fuse panel or your owners manual to see where the fuse is located. The fuse will be called illumination cluster, or ignition cluster. That should solve the issue

The cooling fans are powered by a 50amp maxi fuse and a 10amp AC fuse. No circuit breakers.

The problem is most likely a ballast resistor (usually located outside the heater core in front of passenger side of firewall). This is common when 1 or more fan speeds fail to work.

according to the owners manual it is fuse number 18

It is not a bad job to do. Unhook the battery and remove the cable from the starter. Then unbolt it. Two bolts with 1/2 inch heads

check the compressor turn the air on and turn it to def and you should here a click and motor draw down if not the compressor is bad or out of freon

for the engine to start you need fuel, spark, and compression. one of these things is missing. you have to find out which. to check fuel, locate the fuel rail. it's aluminum colored and runs on either side of the engine above the spark plugs. there is a test valve much like the valve on the tire rim for air. locate this and remove the cap. first prime the system by turning the key on and off a couple of times. this should pressurize the system. press the valve in for just a second, if fuel spurts out under pressure chances are it's not the fuel system. be carefull and catch the fuel in a rag. wear safety glasses. you also could have a bad injector fuse/relay. the fuel cutoff switch might have tripped. this is a safety feature in case of a collision. sometimes they trip hitting a pot hole but rarely.

to check spark you can get an inexpensive spark checker at an auto parts store. it connects between the spark plug and the wire. there are contacts enclosed in clear plasitic which allows you to view the spark.

compression check involves removing each plug and checking pressure with a gauge. better left to the tech. but if your engine seems to crank faster and easier the when it was starting, compression might be the problem.

if you don't have a fuse legend, found in the owners manual, check each fuse with a test light. 10- 20 bucks.

is your check engine light on?