Compressor HOW do i know what kind of ac compressor i need

You didn't say what kind of vehicle this is so I can't help with the relay location however this doesn't sound like a relay problem it sounds as if the system is low on refrigerant or it has air in it. I hope this helps. Take care.

how do you know if it is actually the ac compressor that is at fault ( perfectly good ac compressor from a wreckers /junk yard are available to suit your car at around 70% saving on a new unit )
there are several safety switches in the system that prevent the ac compressor from working
the main reason for ac failure is loss of gas from a leak
next while you can replace the ac compressor yourself , if you have the tools and the know how you will still need a vacuum pump to vacuum the system down to remove the air and a set of gauges to get the right pressure when regassing
first move is to go to an ac specialist shop and have it properly diagnosed and a quote
Then you will and an idea how much you will have to save to get it fixed

What kind of vehicle? It means have your ac inspected. On Toyotas, It is a fail-safe mechanism. The compressor speed and the engine speed are not in unison. So the magnetic clutch dissengages so the compressor doesn't lock down. This can be caused by the serpentine belt slipping, or the magnetic ac clutch relay in the fuse box, or the ac revolution sensor on the side of the compressor. It could also indicate that the compressor itself is going bad. More than likely it the revolution sensor going bad or it is low on compressor oil and freon

I don't know what kind of car this is, but you normally can take out the compressor straight up and out. I have never had to remove the front end.

Use 6-point wrenches or sockets to eliminate slip. From your post:

"i went to go drill the bolt out i got it drilled out but i was putting a new bolt in the alternator bracket cracked so i need to know how i can get the ac compressor off..."

I cannot tell whether the bolt cracked or the bracket cracked from your post above.

Do you have any kind of small cut off wheel?

I don't know what kind of Ford you have but yhe A/C compressor is supposed to cycle on and off in most systems. Is the system cold? I f not the freon is probably low.

seems like you lost your ac charge or you have a bad ac compressor or both. Can be repaired by you with a little ac knowledge 200-300 dollars. compressor dryer oil freon About 700-900 dollars in a shop.Good Luck!!!

Obviously a high pressure ac hose but you mean high side or low side? Sorry I don't know.

When your R-134a runs too low it will NOT engage the compressor. You need to refill your a/c system before the clutch will engage, I also suggest finding the leak.

Any aftermarket refrigerant additives (the ones you can buy at Wal-Mart, for example) come with the oil already in place.  It is a synthetic oil - for this reason, it is incompatable with older refrigerants, which used mineral oils.  A note of advice - if you don't know exactly what you are doing with the A/C system, take it to a professional, as you can really mess it up (overcharging the system, allowing impurities in, etc).  If you cannot afford this, at least buy one of the more expensive refrigerant refills that have the guage calibrated to the temperature outside.  Good luck!