How to Open the Mazda3 Coolant Reservoir Cap?

[Iris]

The method to open the Mazda3 coolant reservoir cap is to first press the cap downward, then turn it to the right to open. The engine coolant reservoir cap should only be opened after the engine has cooled down, as opening it while hot may cause the coolant to spray out, which is very dangerous. There are four key steps for car radiator maintenance: 1. Park the vehicle and turn off the engine. Wait for the coolant temperature to drop, then open the expansion tank and add radiator cleaner. 2. Start the engine and let it idle for 5-10 minutes after the cooling fan activates. 3. Turn off the engine and remove the front bumper. Ensure all mounting screws are loosened before slowly detaching it from both ends toward the center, taking care not to break any clips. 4. After confirming the coolant has completely cooled, drain the radiator cleaner along with the old coolant, then refill with new engine coolant.