- 1). Be aware of issues with your car's heating and cooling system. If your car suddenly begins to blow out excessive heat/cool air or begins to lack in its usual blowing capacity, there could be a problem with the radiator.
- 2). Note how may times your vehicle overheats. Check for coolant system leaks. Avoid putting water in your radiator. Check for cracks in the radiator or bad hoses.
- 3). Check the thermostat by feeling the upper radiator hose right after you start your car. Ensure that the hose gets hot after a while. If the hose doesn't get hot, that means that it is not open and this impacts the fluids that flow through the radiator.
- 4). Use a infrared thermometer to scan the surface of the radiator for cold spots. If you find any spots, that could mean that the radiator is clogged and full of debris. A clogged radiator is one of the most common causes of bad radiators.
- 5). Look at the functioning of the radiator cap. A malfunctioning radiator cap, which builds too much pressure or does not receive coolant, may denote a problem with the radiator.
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