Does car need to be running when putting in coolant?

No, the car does not need to be running when putting in coolant. In fact, it is generally recommended to have the engine off when filling the coolant reservoir. Doing this reduces the risk of pressurizing the coolant system and can help prevent hot coolant from spraying out when opening the reservoir cap.

Here are the steps to adding coolant to your car:

1. Make sure the engine is cool and turned off. This will prevent damage to the engine and also prevents hot coolant from coming into contact with skin.

2. Locate the coolant reservoir. This is usually a translucent plastic tank with a black cap that is located under the hood of the car.

3. Remove the coolant reservoir cap. Be careful as the coolant may be hot and under pressure.

4. Add coolant to the reservoir. The amount of coolant needed will vary depending on the car, so refer to the owner's manual for the correct amount.

5. Replace the coolant reservoir cap and wipe clean any spilled coolant.

6. Check the coolant level again after a few days to make sure it is correct.

Remember, always keep coolant out of reach of children, as it can be toxic if ingested. It is also important to use the proper type of coolant recommended by the vehicle manufacturer, as the wrong coolant can damage the cooling system.