I have a 2009 Aveo . I replaced the thermostat and housing last year. Suddenly the A.C. does not work . The compressor kicks in , all fuses and relays seem good. Freon levels are ok . The coolant hoses get warm and seems like flow but they never feel really pressurized . I burped air out of the system as far as I can tell . This one has me puzzled . Also changed the cabin filter last year . Any help or advice would be appreciated . Thanks!