Symptoms of a Failing Radiator:

Engine Overheating: The most common sign of a failing radiator is an overheating engine. If the radiator can't effectively dissipate heat, the engine temperature will rise, and the temperature gauge on your dashboard will indicate overheating.
Leaking Coolant: If you notice coolant puddles underneath your car or a drop in coolant levels, it could indicate a leak in the radiator or cooling system.
Coolant Discoloration or Rust: Over time, coolant can become discolored or contain debris. This can indicate that the radiator is corroding internally, affecting its performance.
Low Coolant Levels: If your vehicle is losing coolant rapidly, it may be leaking from the radiator or hoses. Low coolant levels can lead to engine overheating.
Cold Heater: If your car’s heater blows cold air, it could indicate that the radiator is not circulating coolant properly, meaning the engine isn't warming up as it should.
Corroded or Blocked Radiator Fins: Visible damage, such as bent or clogged radiator fins, can significantly impair airflow through the radiator, reducing its ability to cool the engine.
Strange Smell: A sweet, syrupy smell coming from the engine compartment can indicate coolant leakage, possibly from a damaged radiator.
Unusual Noises: Gurgling or bubbling sounds from the radiator or cooling system may suggest trapped air or coolant, which could be a result of a radiator issue.

Average Lifespan of a Radiator:

Lifespan: A radiator typically lasts between 8 to 15 years or 100,000 to 150,000 miles. The actual lifespan can vary based on the type of vehicle, the climate (extreme heat or cold can accelerate wear), and the maintenance history.

Factors that affect lifespan:

Coolant maintenance: Regularly changing the coolant helps prevent corrosion and sediment buildup inside the radiator.
Driving conditions: Frequent short trips, overheating, or driving in stop-and-go traffic can shorten a radiator’s lifespan.
Quality of the radiator: Higher-quality radiators made from better materials (such as aluminum or brass) tend to last longer.