2. When the air conditioning is used in high temperatures, the idle speed becomes unstable with excessive fluctuations, acceleration feels weak, and abnormal engine noises occur.
3. After turning off the engine for about ten minutes while it's still hot, it becomes difficult to restart; occasionally, the engine may stall automatically while driving.
4. When the engine is cold, the air conditioning cools effectively, but when the engine is hot, the cooling effect is noticeably weaker; additionally, there is a significant resonant humming noise within the air conditioning system.
5. When the engine is idling while hot, the air conditioning compressor clutch frequently engages and disengages, or may even disengage completely, resulting in no cooling from the air conditioning when the engine is hot.
Solution: Targeted Treatment for Full Recovery
1. Check whether there is excessive dust between the condenser and the radiator. Clean them thoroughly with high-pressure air to ensure proper heat dissipation performance of both the radiator and the condenser.
Friendly reminder: Regularly clean the dust between the condenser and the radiator.
2. When the engine is hot, check the temperature difference between the upper and lower radiator hoses. If the difference is too large, inspect the thermostat’s opening and check if the water pump has an issue with RPM loss.
Friendly reminder: The temperature difference between the upper and lower radiator hoses should not be too large.
3. After the engine is hot, check the return flow from the upper return hose of the coolant reservoir. Poor or blocked return flow can lead to excessively high engine temperature.
Friendly reminder: Do not blindly dismantle or replace parts during repairs.
4. Improper addition or replacement of antifreeze can cause premature blockage of the engine water passages and radiator, leading to high engine temperatures. Antifreeze should be replaced every two years, and only genuine parts must be used during replacement and topping up.
Friendly reminder: Adding water to the engine cooling system, or using antifreeze with a concentration exceeding 60%, can result in high engine temperatures.
5. High pressure on the high side of the air conditioning system; overfilling with air conditioning refrigerant or lubricating oil; malfunction of the self-regulating function of the internally controlled air conditioning compressor, causing excessively high pressure; and blockage of the air conditioning condenser—all these faults increase the load on the engine and reduce the cooling system’s ability to dissipate heat, leading to high engine temperature issues.
Friendly reminder: Both undercharging and overcharging the air conditioning refrigerant will reduce cooling efficiency.
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