![]() ![]() ![]() To fix a failed cooling fan, you will have to get down to the cause and replace the part causing the problem, the relay, motor, a blown fuse, or the temperature switch. ![]() If the cooling fan motor fails, its blades stop spinning, and airflow is not generated. When the fan does not keep the radiator cool, the car coolant reservoir can boil.Ī failing cooling fan is characterized by overheating the engine and often a loud noise coming out of the radiator fan. Wiring problems usually occur due to a blown fuse or connectors eroded over time. A cooling fan may start to fail due to many reasons, including wiring problems. The purpose of a cooling fan is to keep the radiator cool while the engine is off. Pour in some more coolant to normalize the levels. Eventually, the coolant will start coming in smoothly.Īfterward, you may notice that your coolant levels have gone down as the air trapped in it is gone. The bubbles in the coolant will be visible in the coolant at first. Let your car run until the fan comes on and turn your aircon to its warmest temperature and turn its fan to full speed. It is a relatively easy fix if your car’s coolant reservoir is boiling due to trapped air.Īll you need to do is unscrew your coolant reservoir and start the car. It can explain air pockets in your coolant, which may not even be accompanied by overheating. When the engine cools down again, these air pockets contract and the coolant is sucked to replace air, causing bubbles. ![]() When the engine is running and heating up, these air pockets may expand and move into the coolant reservoir. Sometimes, when you refill your coolant, you may follow an improper flushing procedure which can cause air pockets to be trapped in the cooling system. Here are some reasons why this may be happening, explained: Air Pockets It may be due to a failed thermostat, a blown head gasket, or even rust.īefore resolving the issue, you will have to diagnose the cause behind your car coolant reservoir boiling. If you’d like more online advice on a range of car parts topics, see our car parts hub for advice articles and how to guides.If you do not know why your coolant reservoir is boiling, it can be challenging to sort out the problem right away. All our expansion tanks and air conditioning products are available to buy online using our convenient click & collect or delivery service. To ensure your AC and heating systems are working and that you don’t have a leak, head down to your local Autocentres to chat with one of our experts. As with all car components, identifying a problem before it develops could save you a lot of money.Īre you regularly topping up your coolant? If so, you could have a leak in your cooling unit. If you have an issue with your air conditioning but don’t know the cause, Halfords offers a free air-con check in-store which is available on most vehicles. Car expansion tank problemsĪ damaged expansion tank can cause serious issues with your car’s air conditioning and heating systems, leaving you without hot or cold air when you need it most. And this is where the expansion tank comes in handy, collecting the overspill of this important fluid and re-circulating it around the engine. When your vehicle’s ignition is turned on, these liquids increase in temperature which causes them to expand. Liquid and lubricants that sit in a stationary vehicle are stored in the main reservoir at a low temperature. The coolant system consists of a radiator that heats the coolant to its operating temperature. The purpose of a car expansion tank is to store and preserve excess coolant. ![]()
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