How Long After Turning Off the Engine Can You Open the Coolant Cap?

[LeNatalie]

After turning off the engine, wait for about 20 minutes, then touch the radiator hose. If it doesn't feel hot, you can safely open the coolant cap. Coolant Replacement Cycle: For vehicles that run for extended periods, such as taxis, high-quality coolant should generally be replaced once a year. For vehicles with shorter running times, replacement can be done every two years or every 30,000 kilometers. To prevent excessive foaming, which reduces the heat exchange efficiency between the coolant and engine components, ensure the product is within its validity period when adding it. Long-life coolants can have a validity period of up to three years. If suspended particles, sediment, or signs of deterioration or discoloration are found in the coolant, replace it promptly and clean the system. Coolant Composition: The main components of coolant are: 50% purified water, 40% methanol, and 10% other substances. Choosing Coolant: The basic indicators for coolant are its freezing and boiling points. Available in the market are coolants with freezing points of -15°C, -25°C, -30°C, -40°C, etc. It's advisable to choose a coolant with a freezing point at least 10°C lower than the lowest temperature in your region.