When can freon become combustible in a mobile air conditioning system?

Freon, specifically R-12 or R-134a, generally does not become combustible under normal operating conditions in a mobile air conditioning system. However, if the refrigerant is exposed to high heat sources or if there is a significant leak that leads to a build-up of pressure, it could potentially decompose and produce flammable gases. Additionally, in the presence of an ignition source, certain refrigerants can become hazardous. Proper maintenance and handling are essential to prevent such risks.