Can you directly add coolant if it's insufficient?

[OEllie]

You can directly add coolant if it's insufficient, but it must be of the same type. If the same brand of coolant is not available, you can temporarily supplement with distilled water or purified water. Never mix different types of coolant to avoid chemical reactions, sedimentation, or bubble formation, which can damage rubber seals. The functions of coolant are: 1. To provide anti-corrosion protection for cooling system components; 2. To prevent scale buildup and avoid reducing the radiator's cooling efficiency; 3. To ensure the engine operates within the normal temperature range. Precautions for using coolant include: 1. Avoid mixing different coolants; 2. Avoid using low-quality coolant; 3. Do not directly add concentrated coolant to prevent deterioration or low-temperature thickening.