If your car's air conditioner is blowing hot air and the alternator is not charging after replacing the alternator, there may be several potential causes for these issues:
Belt tension: When the alternator was replaced, the belt that connects the alternator to the engine's crankshaft may not have been properly tensioned. If the belt is too loose, it may slip and not properly drive the alternator, resulting in reduced charging capacity. Insufficient charging from the alternator can affect the overall electrical system of the vehicle, including the air conditioner.
Electrical connections: During the alternator replacement, it's possible that electrical connections related to the alternator or other components were not reconnected properly. Loose or disconnected wires can result in the alternator not charging the battery effectively and can also disrupt the operation of other electrical systems, such as the air conditioner.
Fuse or relay issues: There may be a blown fuse or faulty relay in the electrical system that is affecting both the alternator and the air conditioner. A blown fuse can prevent the alternator from charging the battery, and a faulty relay can disrupt the air conditioner's operation.
Electronic control module (ECM) issues: In some cases, a problem with the electronic control module, which controls various electrical systems in the car, could be causing both the alternator and air conditioner issues. The ECM may need to be diagnosed and potentially repaired or reprogrammed.
To address these issues, it is recommended to take the vehicle to a qualified mechanic or an authorized service center. They will be able to diagnose the exact cause of the problems by conducting a thorough inspection and running diagnostic tests. They can then perform the necessary repairs or adjustments to ensure that both the alternator and air conditioner are functioning correctly.
It's worth noting that troubleshooting and fixing electrical issues can be complex, and it's generally best to rely on the expertise of a professional mechanic who can properly diagnose and resolve the specific problems in your vehicle.