How to remove air from the engine cooling system
Changing the coolant is part of the regular maintenance of the car. Maintaining its qualities, and in sufficient quantity, ensures that the engine does not freeze or overheat.
The movement and friction between engine parts means that they have to withstand very high temperatures. For this reason, the coolant, thanks to its composition with ethylene glycol, regulates the temperature of the engine while it is running, keeping it below 90ºC.
Coolant is also popularly known as antifreeze fluid. As well as protecting the engine from overheating, it prevents the engine from freezing at temperatures below freezing.
Overhaul every 20,000 km: this does not mean that it has to be changed. But it is necessary to check levels (in the coolant reservoir there is a maximum and minimum mark) and also if it is clean and has not lost color.
Apparently, changing the coolant seems easy. Some people do it themselves to save a few euros. However, there are some precautions you should consider before doing it.
What happens if the cooling system is not purged?
Although we all know it as antifreeze, it is necessary to know that the name of this liquid is coolant, since its main function is to cool the engine. Likewise, it also works to prevent the freezing of this circuit in extreme temperatures, which is why it is known as antifreeze. It is a key element in the engine of our vehicle, so you should know how to change the antifreeze fluid of the car and perform the correct maintenance.
Likewise, your vehicle’s manual will indicate the type of antifreeze fluid you should use for proper operation. You should also take into account the temperature of the region where you live to choose the most suitable antifreeze:
The first thing you will have to do to change the antifreeze in your car, will be to completely drain the coolant circuit to remove all the old liquid, which will probably have lost its properties. Always with the engine cold, you should open the cooling system -by means of a screw, tap or whatever mechanism your car uses- and let it drain completely.
How to bleed air from the cooling system
It’s no secret that modern cars need several types of fluids to function properly. They need oil to lubricate the moving parts of the engine, hydraulic fluid to operate the clutch and brake, among others.
However, sometimes these fluids can leak out of their original containers. This is especially true in the case of coolant. When this happens, it can spell disaster for your truck, as it is crucial for preventing the buildup of waste heat from the combustion process.
In some cases, however, the leak is not so apparent. Sometimes, you’ll find that you have no coolant leaks at all, but coolant levels are at an all time low. So why does this happen?
In some, particularly severe cases, interior leaks can also be caused by cylinder head cracking or manifold rupture. If you suspect this is happening to your car, have a mechanic analyze a sample of your truck’s coolant.
Coolant flushing and replacement
Antifreeze flushing is a relatively simple process, but there are some notions that should be kept in mind. The first and most important is that not all cars are bled in the same way. There are three types of bleeding system: by the expansion vessel or cap, by means of specific traps and by means of an automatic bleeding system.
The second important notion is that we must be careful not to burn ourselves, because the antifreeze can splash. As we will have to start the engine to bring it up to operating temperature, the antifreeze will be very hot. The third is that antifreeze is toxic, so avoid getting it in your eyes. It never hurts to wear goggles and gloves when working on the car.
This method is the simplest and is the one used in most cars. Once we have put the new liquid in the cooling system (also called cooling system), we must remove the air remaining inside the circuit by the expansion vessel or plug. These are the steps: