Why does the Lincoln MKZ's air conditioning not work after replacing the battery?

[LeRemington]

After replacing the battery, the system data may be lost, requiring air conditioning matching to resolve the issue. Below are the relevant explanations: Expansion valve damage: Damage to the air conditioning compressor, throttle valve, or expansion valve. There's a saying in the industry about air conditioning compressors: 'Low pressure high, high pressure low—replace the compressor.' The probability of air conditioning compressor failure is relatively low, but faults in the expansion valve or throttle valve can directly lead to poor air conditioning cooling. Lack of refrigerant: Since the air conditioning's sealing mechanism is not absolutely airtight, refrigerant generally tends to escape over time. Therefore, most vehicles need refrigerant replenishment every 2 to 3 years. Some cars may even require it annually. If the car's air conditioning cooling performance is poor, and after refilling the refrigerant, the problem recurs after a while.

[AdrianaLynn]

I think this issue is quite common. The AC stops working right after a battery replacement, likely due to mishandling during the process. First, check if any fuses are blown—the current surge when connecting a new battery can easily fry the AC circuit fuse. Next, ensure all connectors are securely plugged in; give the wiring harness in the engine bay fuse box a gentle wiggle to check for looseness. Also, the AC control module may need a reboot after power loss—try disconnecting the battery negative terminal for a few minutes before reconnecting to reset the system. Lastly, some models require dealership reprogramming if settings are lost post-battery swap. Been through this myself—methodically troubleshoot step by step, and avoid long drives until resolved to prevent roadside surprises.

[LawsonDella]

I have experience in car repairs. If the AC stops working after replacing the battery, it's most likely an electronic system issue. During battery replacement, failing to pay attention to current protection might blow a fuse—open the hood, locate the AC fuse box, and try replacing it. Alternatively, the relay might be damaged; listen for a buzzing sound to check. Another possibility is the AC module losing power and locking up, requiring a reinitialization: turn off the engine, remove the key, lock the car, wait ten minutes, and then restart. Loose connections are also common, so check all connectors while you're at it. Don’t attempt disassembly yourself. If you can’t figure it out, take it to a professional shop to scan for error codes. Safety always comes first—don’t risk driving it there.

[TaylorDella]

I have some knowledge about automotive electronics. After replacing the battery, air conditioning failure is often caused by power interruption or reset. A blown fuse is the simplest issue; the air conditioning relay may be stuck and unable to conduct current; the control unit needs to be reactivated by reapplying power after a power loss; poor contact in the wiring harness becomes more obvious after a power interruption. First, replace the fuse or test it with a multimeter. If that doesn't work, check the relay contacts. If still unresolved, disconnect the battery for a few minutes to reset. When sending for repair, remember to scan the codes to identify the specific fault point.