- Air in the cooling system can indeed cause overheating, posing a significant threat to the engine’s optimal performance.
- It is recommended to regularly check the coolant level and quality, troubleshoot leaks, and clean the radiator as well as replace the coolant regularly as needed.
Air in the cooling system can indeed cause overheating, posing a significant threat to the engine’s optimal performance. The cooling system is designed to regulate the engine’s temperature, preventing it from reaching harmful levels. However, the presence of air can disrupt this delicate balance, leading to potential damage and reduced engine life.
Sources of air intrusion
Air can enter the cooling system through various points, such as during coolant replacement if the system is not adequately bled, or due to leaks that breach the system’s seals. A defective radiator cap that does not seal properly can also allow air to enter, disrupting the coolant flow and leading to overheating.
Symptoms of air in the cooling system
The signs of air in the cooling system are varied and should not be ignored. Overheating is the most obvious symptom, but others include a lack of hot air from the heater, unusual sounds from the dashboard, and even a burning smell that indicates the engine is running too hot. A fluctuating temperature gauge can also suggest air pockets in the system.
Also read: Why are cooling systems pressurised?
Impact on engine components
The presence of air can have a ripple effect on various components of the cooling system. It can impede the thermostat’s ability to regulate the flow of coolant, affect the water pump’s efficiency, and cause the radiator to function suboptimally. Furthermore, air pockets can prevent the coolant from reaching certain areas of the engine, leading to hotspots and uneven cooling.
Detecting the presence of air
There is an indirect way to accurately detect the presence of air in the cooling system, i.e. by means of a pressure test. The specific steps are as follows:
- Insert the tip of a rubber ball into the top hole of the tester.
- Squeeze the rubber ball for 2 to 3 minutes to draw air out of the radiator through the test fluid.
- If the colour of the test fluid remains blue, the combustion gases are not entering the cooling system, implying that there may be no air in the cooling system.
Also read: 3 reasons why a car cooling system is pressurised
Maintenance and prevention
- Regular cleaning and inspection of radiators: Radiators should be cleaned regularly to remove dust and small blades and inspected for damage or leaks. This helps to ensure proper coolant flow and heat dissipation.
- Replace damaged hoses and clamps: If you find damaged hoses or clamps, they should be replaced promptly to prevent coolant leaks and system failure.
- Reinstall the Cooling Shield: Make sure the cooling shield is reinstalled to prevent engine damage from overheating.
- Use a magnetic filtration system: For coolant contamination during vehicle manufacturing, a magnetic filtration system (such as Automag) can be used, which has a strong contaminant recovery capability and effectively removes contaminants from the coolant.
- Clean and lubricate pre-filters: for engines with high-density paper air filters, pre-filters should be cleaned and lubricated at regular intervals, every 12 months, and for paper filters, damaged parts should be inspected and replaced, and compressed air should not be used to clean or damaged filters.
- Inspect and maintain cooling fans and motors: cooling fans and motors need to be removed and reinstalled periodically, including removing parts such as bolts, screws and washers.
- Test the temperature sensor: Test the temperature sensor and observe its temperature change in the heated water to ensure that the specified fully open temperature is reached.
- Clearing clogged cooling system: if a clogged cooling system is found, the owner needs to promptly clear the clogged area and replace the coolant filter with a new one.
- Check the air intake system and exhaust system: Make sure that the engine’s air intake system and exhaust system are unobstructed to ensure proper air flow.
- Regularly check and maintain the coolant: It is recommended to regularly check the coolant level and quality, troubleshoot leaks, and clean the radiator as well as replace the coolant regularly as needed.
Air in the cooling system is more than a mere inconvenience; it is a threat to the engine’s health and performance. By staying vigilant for the tell-tale signs of air intrusion and taking prompt action to address it, engines can be safeguarded against overheating.
