Filling and Displacing Coolant

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How to fill and displace engine coolant. Learn about flushing coolant systems in this free car maintenance video.

Part of the Video Series: How to Flush Coolant
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Video Transcript

In this clip we're going to talk about the proper way to flush your cooling system. In this step we're going to talk about the proper service procedure to refill your cooling system with coolant. Now what I'm going to do is hook the other end of my hose up to the T. We're going to use the method of displacement. The reason why I'm putting this hose on here is I'm going to run it into another bucket. What's going to happen is the system is full of very diluted coolant and water so what we're going to do is run straight coolant into the radiator. The weight of that straight coolant is going to displace the diluted coolant and water from inside the engine. You put the hose on to capture that, just being environmentally friendly. You?re going to want to get you vehicle's owners manual and actually do the math. See what the fluid capacity is for your radiator system. If it's two gallons you?re going to have two gallons of water in here so your going to have to add a whole gallon of coolant to get your fifty fifty mix. If you?re in a northern state I would suggest getting a seventy percent mix, your going to want to add a little more. Like I said refer your owner's manual to see exactly what the fluid capacity is. Go ahead and take and add coolant to it now. Got a funnel here. Alright that's my gallon there. I'm going to go ahead and add a little bit more just because I live in a northern state and I want to achieve the maximum freeze protection. That is the proper way to displace the diluted coolant and water out of your system and to fill it back up with the appropriate mixture. Now if you use fifty fifty mix your going to have to displace the entire fluid capacity of the system. That's why I like to use the straight coolant D one hundred percent.

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