Nissan Repair: 2001Nissan Frontier A/C problem, nissan frontier, pressure switch

Question
Hi, The A/C on my 2001 Nissan Frontier works intermittently. When it works is works great but when it doesn't it just blows hot air, The Freon level is fine, I have no leaks, and the fan works very well, What could be the problem.

Answer
Adolfo,

Check to see if the compressor is turning off when the air gets warm.  If it is the pressure switch needs replaced based on you saying the charge is correct.  If not and the compressor keeps running but the air gets warm then the evaporator core is freezing up.