Ford Explorer & Mercury Mountaineer: Reconnecting Heater Hoses and Coolant Controls

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Reconnecting the heater hoses and coolant controls is a necessary step after replacing your car's heater core. Learn to reconnect these hoses and controls 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 reconnecting your vehicle's heater hoses and the coolant flow control valve. What we have here, if you take a look down inside, you can see the nipples of our new heater core. They're indicating by the blue plastic caps. You're going to want to leave this caps on until this step to avoid getting any kind of contamination in your heater core. Now once you're ready to install your new hoses you can take and slip those caps off. Now you don't need to take and reuse these and they've pretty much have served their purpose so you can discard them. Take that one off and slip this one off, just like so. First thing we're going to do is take and slip on this heater core hose and just slip it into position in a rotating fashion and you can see just like that. You're going to slide it all the way on until it bottoms out, you see how it's bottoms out against the seal there, that's what you're looking for. Now they make a lot of tools for working these permanent tension spring clamps, there's one right here you can get a good look at. My favorite tool for these is just your standard set of channel locks. You can get a good squeeze on them and apply leverage to work that clamp in to where you want it at. Go ahead and take and squeeze this clamp down, and slip it into position. There's a pattern, excuse me, on the heater hose where the clamp was from the original installation. As you can see it here on this one indicated. You're going to want to slip that clamp right back into that position. That's the way the heater hose has spent it's whole life and it's really use to having that clamp in that location. So you're going to make sure you get that on in the exact same way. Going to go ahead and take and slip on the second heater core hose, in a rotating fashion, just like so. Until it bottoms out all the way against the seal on the firewall. And again we're going to take our channel locks and operate that permanent tension spring clamp, just like so. Once you have the clamp compressed, you can wiggle it into position and make sure to line it up in the original factory location, just like so. Once you have your heater core hoses on, you can connect the coolant flow control valve. What this valve does, is it shuts off flow to the heater core when you're not using your heat. It's got a little leverage side here which opens and closes a gate and its vacuum controlled. When you command your heater on, it takes and applies vacuum through this hose to this diaphragm and operates the lever. Just going to go ahead and slip that on right like so. That is the proper service procedure for installing your heater hoses and your heater flow control valve on you new heater core.


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