05 Lincoln Aviator turn on ac blow hot air. What can this be. tried freon.

Having sufficient freon in your A/C system does not mean that the A/C compressor turns on, or that it builds any pressure or that there is no restriction in the system. This is why we can offer you a diagnostic to try to solve your issue. Diagnostic starts at $49.50. You can call Pacific Auto Service at 858-457-1977.