How to Flush the Radiator on Toyota Trucks

Flushing the radiator on your Toyota truck can help the engine stay cooler and the truck run more efficiently. Flushing the radiator will also help remove any old radiator fluid that may be inside the radiator. The radiator on a Toyota truck can be flushed quickly and easily.

1. Park the truck on a flat, level area. Make sure the parking brake is engaged to prevent the car from moving while you are working on it. Open the hood and leave the car set until it has cooled down completely.


2. Twist the radiator cap to the left to loosen and remove it from the radiator. You may need to press down on the cap while you turn it to get it to open. If the radiator cap is still hot when you touch it, do not remove it, leave it on and give the car more time to cool down.


3. Place a pan or bucket underneath the truck and radiator. Locate the radiator drain spout and position the pan or bucket directly underneath it. The drain plug will be located on either side of the radiator and will look like a small white piece of plastic.


4. Use a wrench or pair of pliers to turn the plug to the left and remove it from the radiator. Let all of the radiator fluid drain out of the radiator and into the pan or bucket. Dispose of the old fluid and place the pan or bucket back underneath the radiator. Replace the radiator plug.


5. Use a bucket of water and a funnel to fill the radiator with water. Start the truck's engine and turn on the heater. Let the truck run until it begins to heat up. When the truck engine becomes hot or the temperature gauge begins to change, turn off the engine.


6. Slide under the truck and remove the radiator plug to allow the water to flow out of the radiator and into the pan. Dispose of the water and replace the pan.


7. Fill the radiator with new radiator fluid and place the cap back on the radiator. Start the truck to allow the radiator fluid to be distributed to inside the radiator. Let the truck run for a few minutes and then turn it off. The truck can be left parked where it is or driven as usual.