2007 Frontier NISMO with only 24k miles. Yesterday, went to use the A/C for the first time this year. Nada. Ran the A/C for at least 25 minutes and it just blew warm air. Cycled it on/off numerous times, tried MAX A/C, vent open, vent closed, etc etc etc. Nothing. Any known issues with A/C on this truck, anything I can troubleshoot myself? Thanks.