I need an engine diagram of a 2002 ford sport trac so i can figure out where the high and low end air conditioning lines are, or someone to tell me.

Question edited for clarity.
Question moved to sub category.

You also need to Google the wiring schematic for the new aftermarket unit.

2002 Ford Explorer Sport Trac Radio Wiring Diagram

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It's one wire in and one wire out.
https://www.rockauto.com/en/catalog/ford,2005,explorer+sport+trac,4.0l+v6,1430691,electrical-switch+&+relay,door+jamb+switch,4360

There are lots of issues with them

https://www.google.com/search?q=+2005+ford+sport+trac+door+ajar+switch

Wiring Diagram

https://www.explorerforum.com/forums/threads/2002-explorer-door-ajar-warning-light.374966/

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http://ww2.justanswer.com/uploads/HE/heavychevy396/2014-04-27_164823_wd_ford_140586.pdf

http://ww2.justanswer.com/uploads/HE/heavychevy396/2014-04-27_164835_wd_ford_140587.pdf

why not buy a manual as it has a lot of good info you will need and you will probably use the manual for other things.

Ford has a history of problems with their IACV. Idle air control valve. When these go bad, the idle is usually uneven and the engine will die because it is not opening and allowing enough bypass "idle" air around the throttle plate to sustain the engine for idle. A word of caution, If you decide to buy one, don't get the cheap Autozone ones. they don't hold up long. Go for the Ford brand. I would however have someone check it before you spend the money, it may be something completely different.

that is in the owners manual to acess a free PDF of the owners manual go to the Ford site at link below. the fuse box diagrams start on page 127 of file
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp

If it is low on freon,you want the low side to hook up your one hose.it is near the firewall in the liquid line.

I am guessing you are talking about air conditioning ports?, if so, word of thumb,the port on the large diameter hose is low side and the smaller diameter is the high side or pressure side.

I see your vehicle is a 2007. You may still have WARRANTY depending on service date and mileage. It may be low on Freon. Look under the hood when the engine is running and observe if the Compressor clutch is engaging.

You should hear some clicks and the front part of the compressor beyond the belt should be turning with the engine. If the compressor clutch is not turning you need to test the pressure and if low add Freon.

There are 2 pressure sensors, a low and a high and the ideal pressure is midway between them. This usually is the total amount recommended per the car refill decal sticker. The fill point is either on the oblong black tank or close to it on a hose.

You need to check for leaks. It is a closed system. There is an opening that let out the old Freon. Some of the Freon cans have a leak tracer. Some have a sealer. If you only have to add Freon every 3 years its not so bad. But it could leak the new Freon in 3 days. You just don't know till you try.

There are Freon cans with the fill hose already on them. You may be able to get a loaner set of Manifold gauges from Autozone or Oreillys for a deposit. They also have the Vacuum pumps to condition the system. Good Luck with your repair.