Does anyone have any tips for changing an ac condenser on a 99 tahoe? I have never messed with the ac system before. I know there is some type of oil in it but I am not sure what type or how to use. Any tips would be greatly appreciated.

Welcome to the forum. Do you know for a fact it is the condenser that is responsible alone for the leak? How many miles are on the Yukon now?
This is not what I consider a Do it yourself project. IMHO it should be dealt with by a certified A/C tech.
The system has environmentally sensitive refrigerant & should be evacuated properly first.
Once the system then passes a pressurization test, the PAG, hygroscopic oil and refrigerant gets added back into the sealed system, based on high and low psi/ vehicle specific requirements.
Quite often there may be other leaks. A compressor issue for instance, may require flushing due to metal particles and a larger filter may be then added, to further protect system.

Thanks for the reply. The system lost all refrigerant when the high pressure port didnt fully seal when the refrigerant was replaced. While trying to remove the high pressure port the stem busted resulting in a need for a new hose assembly. While trying to change the hose assembly the high pressure port line goes to the condenser and was seized up causing the the line to crack on the condenser side while trying to loosen the hose. Which is where I am now. I can get a replacement for around $100 and replace myself then take it in for new refrigerant. Truck has just over 200k miles currently. Not something I would normally try and tackle but cant afford a several hundred dollar repair bill at this point either. I repair machines for a living, just not cars. At the end of the day it is a machine so I'm confident I can do it. I'm just looking for any advise or tips available to have a better idea of what to expect.

When you get the condenser out, carefully drain all oil out of it into a measuring cup. Whatever you pour out, you will replace with new PAG R134a oil. Now that the system is opened up, replace the orifice tube and the rcvr/drier. Use all new o-rings when reconnecting. Use an A/C vacuum pump to pull the vac down for at least 10 mins to boil off any moisture. You can rent them from autozone. Then, inject the lost amount of new oil, then add your vehicle spec amount of freon.

Thank you for the reply. Where are the orifice tube, and drier located? Any specific brand better than another? The hose assembly I got from four seasons has all new o-rings include for that hose anyway. How do I inject the oil after system has had a vaccum pulled?