Ford Explorer & Mercury Mountaineer: Filling Coolant & Reconnecting Battery

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Reconnecting the battery is one of the last steps to perform after replacing your car's heater core. Learn to reconnect the battery and fill your coolant from a certified mechanic in this free automotive video.

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Video Transcript

Here we're demonstrating how to change a heater core on a late model Ford Explorer or Mercury Mountaineer. In this step we're going to talk about the proper service procedure for filling our vehicle with coolant and connecting our battery back to the rest of the vehicle. Pretty much what we're going to do is just take our funnel and slip it in the fill neck of the radiator. I have here 50/50 mix, ready to go coolant, as you can see right up here in the corner, it's rated for negative 34 degrees, which is the minimum you're going to want to use in the Northern states. If you like in say Canada or up in Alaska, you're going to want to use the chart on the back and convert, and you can use up to like a 75% coolant, 25% water, which would give you even greater freeze protection. We've got a 50/50 mix here, I'm just going to go ahead and add it to the system. I got it most of the way full already and have ran the engine for a brief amount of time to take and try and pump it through. So we're going to top off the radiator and fill up our overflow jug, right there. Go ahead and slip on the radiator cap itself, and move over to the overflow jug of the vehicle. You're going to want to take and put a significant amount of coolant in the overflow jugs. You can see we have two jugs here, one is for washer solvent indicated by the label on it there and the words, this is for coolant. I'm going to take and pop it open, just like so, and begin filling it up...and right there. I'll go ahead and put the cap back on and set this aside. Now take and remove your funnel, and flip down the lid, just like so. What you're going to want to do is take and run the vehicle through its' entire warm-up cycle. You're going to want to have the heat on full blast, take and drive it for approximately 10, 15 miles to make sure all the coolant is pumped through the systems and that all the air bubbles have been pumped out of the system. The air bubbles will actually vent through your overflow tube into the jug and come out. Now when they come out, you're going to shut the vehicle down, and as the coolant in the block contracts just due to siphon action, it's going to draw coolant through the overflow jug. Once it's sat overnight, you're going to want to take and get another look at your overflow jug and make sure that it's at the full cold level. That is the proper service procedure for taking care of your coolant and topping off the system. Now what we're going to do is indicate to you how to connect your battery. During our heater core service we had a huge amount of dash components removed from the vehicle, we had computers unplugged, all sorts of radio devices and things of that nature, when you do that you have to de-energize the systems. You do that by removing the negative battery cable. We're going to go ahead and slip the negative battery cable back on, and tighten it down. You're only going to want to tighten it down until the connector stops spinning, you see how it spins right there? If you over-tighten it, it is possible to break this terminal. So right there, you can see it doesn't spin, I'm going to go ahead and verify the positive as well. That is the proper service procedure for reconnecting your negative battery cable back to the battery.


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