How to Bleed the Cooling System When Engine Temperature is High?
3 Answers
Engine temperature is high bleeding method is as follows: 1. If the temperature rises while driving, the car should not continue to be driven. Park the car in a safe location. 2. Turn on the hazard warning lights and wait in place for about 15 minutes to allow the engine to cool down on its own. During this time, you can look for water. 3. Open the hood of the Wuling vehicle, wrap a cloth around the cap of the expansion tank and slowly open it. When opening the cap, be sure to unscrew it slowly to prevent hot steam from escaping and causing injury. After filling the expansion tank with water, open the passenger seat and locate the throttle body. 4. Use pliers to remove the clip on the throttle body outlet hose. The water inside this hose should normally be flowing, but when the temperature is high, it will be filled with gas. Be careful not to get burned by the hot steam when removing the hose. 5. When water starts flowing out of the throttle body outlet hose, you can start the engine and continue adding water to the expansion tank until there is no air left in the throttle body outlet hose. Generally, 6 liters of water will be enough to completely bleed the air.
I've dealt with quite a few overheating issues, and the key to bleeding is locating the cooling system's air bleed screw. It's usually positioned at the engine block or at high points in the coolant hoses, such as near the thermostat. During operation, keep the engine idling until the coolant temperature rises to the point where the thermostat opens, initiating full coolant circulation. Gradually loosen the bleed screw with a small wrench – you'll see air bubbles escaping. When the flow becomes steady without bubbles, it indicates complete air removal. Remember to place a cloth underneath to catch any spilled coolant, and top up the antifreeze to the mid-level mark afterward. The location of bleed ports varies significantly across models – Japanese cars often use screw-type vents, while some German models feature hoses with bleed nipples on the radiator side. Exercise extreme caution throughout the process to avoid burns from hot components.
Bleeding the cooling system is actually not difficult. I often teach fellow car enthusiasts to do it this way: First, check the coolant level with the engine cold by opening the radiator cap and top it up if needed. Start the engine and warm it up until the temperature gauge reaches the middle position, at which point the thermostat is usually open. Locate the highest bleed screw on your engine, then use a wrench to loosen it slightly by half a turn—you should hear a hissing sound as air escapes. Maintaining the engine speed around 1500 RPM can improve the bleeding process. Once the coolant flows out steadily without bubbles, tighten the screw immediately. After bleeding, it's best to rev the engine a couple of times to ensure stable coolant temperature. Note that many modern cars now use an expansion tank instead of a traditional radiator cap, so the bleeding method may differ—always refer to the specific vehicle's manual.
