a/c 2001 ford ranger 3.0 won't blow cold air good air just doesn't cool down

The compressor is likely shot--they typically need to be replaced every 100,000 miles. This link may help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-9.html#post1864159