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Any decent scan tool will have cruise condition inhibit parameters displayed either in ECM or BCM data. This can help you isolate why its not working. -
Your refrigerant is low. Your symptoms all highlight this. Whether you have an actual leak or have just lost the original charge over the years (about .2-.3 oz per year decay is a thing) remains to be seen. You can connect a gauge set to verify, but you'll really need to evacuate, recharge and monitor for a leak.
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Ain't nobody got time for that. The code numbers are sufficient. Google, service info, Chiltons, will all easily elaborate on the definitions. Anyone thats been working on cars for a hot minute will know these very common, as well as global OBD standard, codes with not much else given. You have a wiring issue, as P0449 is a circuit fault. Focus on finding that, and the other two DTCs which are rationality based, will likely be resolved too.
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Definitely worth flipping through the manual just for those oddball scenarios, even if you think you know your car inside and out.
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