1. Install the correct size adapter and tighten to it does not leak. Place the gasket facing down. 2. Your car should be off, do not start the car! Fill the coolant funnel about 1/3 full when it is cold so that when the system burps, liquid will fall into the system instead of more air. 3. Go to your car and set the climate control setting (or heat setting) to hot, but make sure the fan/heater is on "off". 4. Now start your car and let the car idle for a while until it is hot enough to open the thermostat and turn on the fan. After waiting, once the thermostat opens to cool your engine, You will see the coolant level drop and some to a lot of will appear, this is air escaping from your cooling system. 5. After an hour of standard operation, if you still see out, check the overflow tank and make sure there is coolant in it. The fluid level should be low when the engine is running. Keep the RPM at idle. (If you find that the fluid level has too much, turn off the engine. Wait for the fluid level to drop before restarting the engine.) After the stop, use the liquid plug to plug the remaining liquid in the funnel. The long extension rod is designed for hard-to-reach areas and can be used at any angle. The thread reinforcement design ensures that the liquid will not leak under any circumstances. The Spill Free Funnel is perfect for engine flushing, coolant pressure tester kit. The Spill Proof Coolant Filling Funnel Kit can deliver fluids and oil to vehicle, the long burp funnel prevents spills and trap air during refills after a coolant flush. Note:Due to different production batches, the colors and styles of some accessories are random and cannot be specified, which will not affect the use. Colour:As Shown Material:Plastic Package Contents: 1 *Coolant Funnel Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.