- 1). Consult your owner's manual to find out how much coolant your radiator will hold. To ensure the correct mixture, mix the antifreeze 50-50 with water. If your radiator capacity is six gallons, use three gallons of antifreeze and three gallons of water to fill it.
- 2). Check the engine to ensure that it is cool. The truck should rest three hours after driving before changing the antifreeze.
- 3). Open the petcock valve at the bottom of the radiator and allow the radiator fluid to drain. Place a collection pan under the radiator to collect the fluid. Remove the radiator cap to speed up the draining process.
- 4). Close the petcock valve when the radiator has finished draining. Place a funnel into the radiator spout. Pour the antifreeze into the radiator. Fill the coolant jugs with distilled water and pour the water from each antifreeze jug into the radiator.
- 5). Reinstall the radiator cap. Start the engine and let it run for five minutes. Turn the truck engine off and allow it to cool. Remove the radiator cap and check the fluid level. Top the level off with water and put the cap back on.
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