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Thermostat and Housing; 203 Degree (12-18 3.6L Jeep Wrangler JK)

Item J113832
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      Video Review & Installation

      Merideth: Hey, guys. So, today we're checking out the 203 Degree Thermostat and Housing fitting all 2012 into 2018, 3.6-liter JK Wranglers. Now, efficient cooling for your JK is absolutely necessary, especially if you take your Jeep off-road or live in a warmer climate, where engine heat soak can be an issue.Now, common failure with the JK is the thermostat getting stuck shut, which is a big issue, or a cracked thermostat housing, which can cause overheating or other bigger issues down the line if it's not addressed. Now, this thermostat and housing will be a direct replacement for your factory components and will be great if you are currently experiencing any cooling issues or looking to do some maintenance on any worn or old parts, or you simply just want a spare for those just-in-case moments. Now, this will have an OEM-style build with a metal and plastic housing, mimicking the factory one, and will open up at the factory spec of 203 degrees, allowing coolant into the system for efficient cooling. Now, this will also come with a gasket here to make sure that everything is sealed properly and ready to go.Now, not only is this an easy way to prevent any cooling issues, but it's also incredibly affordable coming in at roughly $50. Now, for a part that when failed, can cause larger issues and more expensive issues down the road, I think that $50 is definitely a no-brainer. Now, in comparing this to other options available on this site, some other choices will usually be set up very similar to this one, or they may be separated. So, instead of both components coming in a kit, or together, here, you may see choices that will come with just the thermostat or just the housing. Then there are going to be other more expensive choices that will usually offer a little bit more performance than this stock-style thermostat being that they will open at a lower temperature, allowing more coolant into the system earlier. Now, that's good if you're really wheeling your JK hard or you know that you're very susceptible to heat soak and overheating. But if you're not necessarily in that boat, and you're just looking for a replacement or maintenance, or just want to keep on hand, then this is going to be a great choice.Now, as far as install is concerned, I'm gonna give this a 3 outta 3 wrenches on the difficulty meter. However, if you've done this before or you have mechanical experience, should only take you about an hour to get the job done. Now, for install, you're also gonna need some basic handles, including a torque wrench, a ratchet, an 8 and 10-millimeter socket, pliers, brake cleaner to make sure that this thing is free of any contaminants, and a funnel as well as a drain pan. You're also gonna need some additional coolant because once you take the radiator hose off of the stock one or the one that is currently on your Jeep, it is going to drain some coolant. So you will have to replace it there. But one of our customers has installed this on their JK and is gonna walk you through that process, step by step. Let's go ahead and get into the install.Man: Okay. So, we're going to open up the new thermostat. Just check to make sure everything's good on it before we pull the old one off. Another thing I like to do is this is an air-bleed valve up on top, I like to loosen up that bleed, make sure it's gonna be easily opened and closed after the thermostat's installed. Okay. So, let's get to taking off the old one. A way to find your thermostat if you don't know where it is, is just put your hand on the top radiator hose, follow it down, and where the hose ends will be your thermostat. So, quite simple, easy to locate.We need to start clearing out the area so we can get down to the thermostat. And the main thing you see, that you're gonna have to get rid of or remove, is the air intake manifold. And that's done quite simply. First thing we do is remove these two 10-millimeter bolts. And then we loosen up the two worm clamps, and then we can pull it out. Okay. So let's start with removing these bolts. And they're not in tight, don't need to be real tight. Then, a good friend of mine taught me that whenever you remove these parts, have a part dish to put them in so you don't lose them and you're not wandering around the garage looking for them later. So, there's our part dish, magnetic, they won't drop out.And now, we'll go to an 8-millimeter socket. And I like to use it just on a screwdriver handle. So, we will loosen up the worm clamps. They don't need to be real loose, just loose enough to be able to remove the air intake valve. All right. Do that. Pull the hose off. Pull it off the... Okay. So, when you remove this air intake assembly, there's a thermistor right here, that's connected to wiring so the computer can read air intake temperature. You wanna push that clip down and pull it off. Okay. And then we can just set this aside. Okay. So, now you can see that you have easy access to the thermostat. And we can get to removing it.First thing we're gonna do is we're gonna put a bucket under here and remove the clip on the top radiator hose. So, in order to catch the antifreeze that's gonna come out of this hose and then ultimately out of the thermostat body, I like to use an aluminum pan. And the nice thing about these pans is that you can bend them and form them and fit them into tight spots. So, we're gonna do that. Now, you can see that this reservoir bottle is kinda in the way, so I'm gonna pull that out. And that's a very simple thing to do. The reservoir panel or bottle is held on with a clip here. We're just gonna pop that clip and then the whole thing lifts right up. Before we do that, I'm gonna remove the hose, just tuck it right back in the bottle, so we don't lose anything. And now, I'll remove that clip, and we can do that, just a pop clip, pop the center out, and then pop the whole thing. And the key is to pull the center up. And then this bottle just simply straight up and out. Now, we can get this pan in here to catch all of the fluid. So, you can see to kinda bend it in there, relatively sturdy. Okay.So now, we're gonna remove the hose. And like I said, I'd like to use this hose clamp removal tool. I'm just gonna spin that around till it's on. And so, you can see we've got fluid coming out. And now, I just wanna move that clamp back. Okay. So, I've moved it back down the hose. You can leave the clamp right on it if you want. And now, I'm just gonna back the hose off. And, again, remember, you're gonna get the fluid out of this. Okay. So, not a ton of fluid, but we caught it all. If any had missed the pan, it would've gone in the safety container we have down below.So now, it's time to actually remove the thermostat. And that's quite simple. There's two bolts, one on the top, one on bottom. And those are 10-millimeter bolts, and we'll just remove those with a ratchet. Okay. So, for removal, 10-millimeter ratchet. Now, you're going to loosen the top first. And bear in mind, when this is removed, we're gonna get some more fluid out of it. Now, one of the things you might notice is you can see where that pan is, it's not actually up against the engine. So, I'm gonna get a little piece of plastic that's gonna cause fluid to run down into the pan rather than onto the engine. So, give me a second. Okay. So, I went and found a piece of plastic sheeting. I just cut off a small amount of it. I'm gonna tuck it in here under the thermostat, so when fluid drains from the engine body, when I remove the thermostat, it'll come into the pan with the rest of the fluid, okay? Just kind of a helpful thing to reduce the splatter. And we'll pull the bottom one completely out. You can see we got some fluid coming out now. All right. Now, we're gonna go to the top and remove the 10-millimeter bolt completely. Okay. So, I've gotten a longer extension to make it a little easier for me. These are long bolts. The top one is out. Put it in our parts pan. Now, we go to the bottom. Okay. Yeah. There is the old thermostat.Now, one of the things you notice, there's a rubber ring, a seal that goes in there, and it's not in there, but it is stuck to the engine. So, we have to get in there, pull it off, and then we'll clean that up. So, you can see there's some black residue where that seal was. We'll get in there and wipe that all down. And I'll put a little brake cleaner on a rag, and we'll get that all off. All right. So, now I've got a rag, just going to clean the surface off here. You can see the rag doesn't really get all of this black residue. So, we're going to use a little brake cleaner fluid. Just spray that on. Okay. Now, if you have anything that's really tight on there, you can use a razor blade, but just be careful not to score the surface. That surface is where the seal needs to have a nice smooth area to sit on. Okay.So now, we're gonna put in the new thermostat. One of the things you want to do is check to make sure that seal is in the thermostat body. Now, just a quick installation. And grab two 10-millimeter bolts. Fits in there very easily and nicely. Okay. I'll start with the top bolt, and we'll put in the bottom bolt, and get that started. And it would help if you had an electric ratchet here. And you don't wanna get that too tight. We're gonna torque these bolts down to the manufacturer's spec, which is 105-inch pounds. So, we'll just get this hand-tight first. Okay. Now, I'm gonna go and get a small torque wrench, and we'll torque those to a 105-inch pounds. Okay. So I've got a small torque wrench, I've set it to 105-inch pounds, and now we'll just torque the upper and lower bolts. There we go. Top one is done. Okay. All right. Torque to 105. Okay.So, we're pretty close to being done now. Now, all we gotta do is put the radiator hose back on. And you wanna slide it all the way up to the stop right there. Don't go beyond that. And then put your clamp back to the same position it was before. And it's a little slippery because some antifreeze got on that hose. Okay. So I got the clamp back in its original position. Now I'll just release the hose clamp pliers. And it's like it was. Okay.So now, we're at the point where we wanna return that antifreeze to the radiator. And I'd strongly suggest getting one of these antifreeze radiator filling systems. They come with multiple caps and attachments for many different types of radiators. But essentially, you'll find the cap that works for your radiator, slide the attachment into it. That will go into the radiator itself, and then you just tighten it down. So, this funnel then can sit right in, on top of there, makes it much easier to pour your antifreeze back into the engine. So, here is the antifreeze that we recovered from the pan, and we'll just pour that back in. Let's get some antifreeze in the funnel. Then you wanna go in this little valve here, open it, and you'll hear the air coming out of that. Okay. You just wanna open enough to get rid of all the air, then you're good to go. So, all we have to do now is just put back in the air duct, and we'll be good to go. So, I'm not gonna put this cap on tight, I'm just gonna set it here because what you wanna do is after you get everything reassembled, you wanna start up the engine and burp any remaining air out of it, okay? And that air will come out through your radiator cap area.So, next thing we need to do, remember that we unplugged the temperature sensor, and that goes right in here. We'll plug that back in until it clicks. Then we will reconnect the air intake to the air filter box and carburetor. And then we'll get our two screws...two bolts, I should say. Okay. So now, we've put the air intake manifold back on, I've put the antifreeze reservoir back in. And all we gotta do is put the top back on, and you'll see there's two little tabs there that'll go in the back that will line up the rest of the tabs, and you're good to go.Merideth: So, that's gonna wrap it up for my review in the install of the 203 Degree Thermostat and Housing fitting all 2012 to 2018, 3.6-liter JK Wranglers. For more videos and products just like this, remember to always keep it right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Thermostat & Housing
      • Opens at 203 degree
      • Provides Improved Coolant Flow
      • Maintains Correct Engine Temperatures
      • Avoids Overheating
      • Superior Fit for Greater Reliability
      • Automotive Quality Metal and Plastic Construction
      • Black Finish
      • OEM Dimensions for Superior Fit
      • Factory Replacement Installation
      • Twelve-Month Warranty
      • Fits 3.6L Jeep Wrangler JKs from 2012-2018


      Happy New Engine Cooling. Over time, your Jeep’s thermostat housing can become furred up or damaged, leading to poor performance of the thermostat and the overall engine cooling system. The last thing you need when you’re tackling the great outdoors is for your engine to give up the ghost in a cloud of hot steam. Fit this superior-quality replacement Thermostat Housing for a happier, cooler engine.

      Designed and Engineered to Exact Factory Specs. This Thermostat Housing is a simple fit for your 3.6L Jeep engine. It’s made from superior-grade automotive metal and plastic, with an attractive black finish that will look smart in the engine bay.

      Direct Factory Replacement. The Thermostat Housing is designed and manufactured in line with all OEM specifications. Installation involves removing any stock housing and bolting on this quality replacement.

      Twelve-Month Warranty. You get a 12-month/12,000 mile limited warranty on the Thermostat Housing.

      Application. The Thermostat & Housing fits 2012-2018 Jeep JK Wranglers with the 3.6L engine.



      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Thermostat
      • (1) Gasket

      Customer Reviews (64)

        Questions & Answers

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