Open the valve on the intake hose and put the coolant into the system without any air bubbles. Now place the suction hose in the container you have at the ready. Fill the intake hose with cooling water so that air bubbles are not sucked in again. Keep a proper coolant ready in a separate container. As soon as the system has been vented and a vacuum has been created, close the valve again. Open the compressed air valve and create negative pressure. Connect the compressed air with a maximum of 8 bar to the bleeding unit. To begin, screw the coolant reservoir on and fit and fasten the universal adapter. At the same time you can check the circuit to make sure it’s watertight and free of any leakage. You can then pump new coolant free of bubbles into the system via a suction hose. The latter first creates a vacuum in the empty cooling circuit. Tip: To bleed the cooling system with negative pressure, you need a special tool – a so-called cooling system filling and bleeding device. That’s why we will show you another way to bleed the cooling system – with negative pressure. Some BMW or Porsche models cannot be bled correctly with the previous instructions. Bleeding the cooling system with negative pressureįor some vehicle manufacturers, the bleeding process is a little more complicated. If you are not sure or not confident enough to do this yourself, we recommend you leave the venting of the cooling system to a mechanic that you trust. The position of the bleed valves also varies depending on the vehicle. Some vehicles do not have any bleeder valves, others have one or more. At this point, it’s a good idea to take a quick test drive and to top up the coolant, if necessary.īasically, you can use these instructions for any vehicle model. You can now close the expansion tank again and shut the bonnet. Set the fan to the lowest setting and the heating to the maximum. Start the engine, letting it warm up and keep an eye on the temperature gauge. If only liquid without any bubbles comes out, you can go ahead and close the bleeder valves again. Check to see if there are any bubbles coming out. Then close it again and start the engine and let it run. If there are bleed valves, you can now proceed by opening the expansion tank and filling it up to the maximum mark with the new coolant. Next, you’ll need to mix the coolant in a clean container following the ratio specified in the instructions. Please note that it should be disposed of in the same way you would dispose of used oil. How to vent a radiatorįirst of all, you should drain the cooling water and dispose of it according to legal requirements. This is why you should bleed the radiator after each refilling of coolant or antifreeze. The result is a decrease in cooling capacity and a subsequent increase in temperature, which can lead to overheating. Otherwise, tiny air bubbles prevent the proper circulation of the coolant. Here, too, air that has entered can be removed by bleeding. The same goes for the vehicle’s cooling mechanism. In a heating system, the problem can be solved by bleeding the radiators. If air enters, this circulation is compromised and this can lead to a reduction in efficiency as well as potential damage. The heating and cooling systems function on the same principle: water is designed to circulate within a self-contained system. We will show you what you need to consider in order to restore the trouble-free circulation of the cooling water. Venting of the radiator should always be carried out properly. If you can rule out a leak, the most likely cause is air entering the cooling circuit. If the engine temperature rises for no apparent reason while you are driving, there is probably a malfunction in the cooling system.
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