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I recently bought a Chevy traverse and within a day the check engine light came on. Code P0420 came up which I replaced the catalytic converter and there was in issue with the alternator and the something else car stayed in the shop for 2 weeks now I just got the car back and the air on the driver side is blowing hot and code P0451 is showing up. Don’t know anything about cars this is so frustrating!!
 

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A/C and code are separate issues.
P0451 CHEVROLET Meaning
The Evaporative Emission (EVAP) system is used to store fuel vapors in order to reduce the amount of fuel vapors into the atmosphere. The Fuel Tank Pressure (FTP) sensor is only used for EVAP system diagnostics. The FTP sensor is a transducer that varies resistance according to changes in the fuel tank pressure. The Engine Control Module (ECM) monitors the FTP sensor signal in order to detect vacuum decay and excess vacuum during the EVAP system diagnostic test. The ECM supplies a 5-volt reference and a low reference circuit to the FTP sensor.
 
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