Radiators fail due to heat stress, corrosion, physical damage, and coolant breakdown. Below are the proven global causes.
1. Internal Corrosion
Coolant degrades into acidic compounds.
Facts
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Corrosion begins after 2–5 years without coolant replacement
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Causes internal blockages
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Reduces heat transfer by 30–40%
2. External Debris Blockage
Dust, mud, insects block radiator fins.
Measured Impact
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10–20% reduction in cooling efficiency
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Overheating during uphill or heavy load
3. Cracked Plastic Tanks
Plastic side tanks expand and contract with heat.
Failures Occur At
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120,000–200,000 km
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High heat zones (Africa, Middle East)
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Poor coolant maintenance
4. Water Pump Failure
If the water pump fails, coolant flow stops.
Results in instant overheating and radiator pressure spikes.
5. Damaged Radiator Fins
Bent fins reduce airflow.
Loss of efficiency: up to 15%.
Conclusion
Radiator failure is caused by corrosion, debris blockage, cracked tanks, and poor coolant flow. Regular coolant flushes and external cleaning extend radiator life significantly.
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