First of all, loosen the screw on the bleeder with the recommended spanner or a screwdriver. Then we connect the towel dryer to the power supply, turn on the thermostat and wait until the liquid warms up. Once it is hot enough, the antifreeze will start to flow out of the drain valve and when the antifreeze stops flowing out, you can proceed to tighten the screw and clean the towel dryer.