Retired HVAC tech. Here is how this works. If they claim there is nothing wrong ( no punctures, disconnect of lines or leaks of any kind) Then this means the system has been proven sealed. If there isn’t any refrigerant in the system and the system is tight as they are claiming then the refrigerant had to be removed. Since no one removed the refrigerant, then their claim of a sealed system is false. Now, the bumper removal and install of an aftermarket bumper does take place right at the condenser for the AC system. I suspect the system isn’t sealed and a leak has been created during the bumper install or afterwards by a bumper component rubbing and creating a leak. . The leak must be small because an actual puncture would have allowed the gas to escape with pressure. As far as “ smelling” the refrigerant, it would again have to be a massive leak to otice a smell. You should be able to inspect the AC system and see refrigerant oil where the leak is. Pressurizing the system with Nitrogen is how a leak can be detected. Pulling a vacuum with a vacuum pump and a thermistor gauge can also provide proof of the systems integrity.
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