Step 5 - check clip and hose
The next step is to check the rubber tube and clip of the water tank. It has two hoses: one at the top of the water tank to discharge high-temperature coolant from the engine, and one at the bottom to circulate the cooled coolant to the engine. The water tank must be drained to facilitate hose replacement, so please check them before you flush the engine. In this way, if you find that the hoses are broken or leak marks or the clips look rusty, you can replace them before refilling the water tank. Soft, congee like sticky marks indicate that you need a new hose, and if you find any of these marks on only one hose, replace two.
Step 6 - drain the old coolant
The water tank drain valve (or drain plug) shall have a handle to make it easy to open. Just loosen the twist plug (please wear work gloves - the coolant is toxic) and allow the coolant to flow into the drain pan you put under your vehicle in step 4. After all the coolant has been drained, replace the twist plug and fill the old coolant into the sealable container you have prepared next to. Then put the drain pan back under the drain plug.
Step 7 - flush the water tank
You are now ready to perform the actual flushing! Just bring your garden hose, insert the nozzle into the water tank and let it flow to full. Then open the twist plug and let the water drain into the drain pan. Repeat until the water flow becomes clean, and make sure to put all the water used in the flushing process into a sealable container, just as you dispose of the old coolant. At this time, you should replace any worn clips and hoses as necessary.
Step 8 - add coolant
The ideal coolant is a mixture of 50% antifreeze and 50% water. Distilled water should be used because the minerals in tap water will change the properties of the coolant and make it unable to operate properly. You can mix ingredients in a clean container in advance or inject them directly. Most water tanks can hold about two gallons of coolant, so it's easy to judge how much you need.
Step 9 - bleed the cooling system
Finally, the air remaining in the cooling system needs to be discharged. With the tank cap open (to avoid pressure build-up), start your engine and let it run for about 15 minutes. Then turn on your heater and turn to high temperature. This circulates the coolant and allows any trapped air to dissipate. Once the air is removed, the space it occupies will disappear, leaving a small amount of coolant space, and you can add coolant now. However, be careful, the air released from the water tank will come out and be quite hot.
Then replace the water tank cover and wipe any excess coolant with a rag.
Step 10 - clean and discard
Check the twist plugs for any leaks or spills, discard rags, old clips and hoses, and disposable drain pans. Now you're almost done. Proper disposal of used coolant is as important as disposal of used engine oil. Again, the taste and color of old coolant are particularly attractive to children, so don't leave it unattended. Please send these containers to the recycling center for hazardous materials! Handling of hazardous materials.