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How to Replace Thermostat 06-10 Ford Explorer

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How to Replace Thermostat 06-10 Ford Explorer

Created on: 2017-05-22

How to remove, install, or replace a leaking or cracked cooling thermostat on 06 Ford Explorer

  1. step 1 :Draining the Coolant
    • Have a drain pan ready
    • Release the radiator drain cap
    • Allow the coolant to drain
    • Close the cap
  2. step 2 :Removing the Coolant Overflow Bottle
    • Have a drain pan ready
    • Remove the coolant hose from the radiator
    • Remove the two 10mm bolts from the coolant bottle
    • Lift the bottle up and out
  3. step 3 :Removing the Air Intake
    • Loosen the two hose clamps
    • Pry the green tab up and disconnect the breather line
    • Disconnect the second hose from the air intake
    • Remove the air intake tube
  4. step 4 :Removing the Throttle Body
    • Pull back the red safety tab
    • Disconnect the throttle body lead
    • Remove the four 8mm bolts from the throttle body
    • Remove the throttle body
  5. step 5 :Removing the Thermostat
    • Disconnect the hose from the throttle housing
    • Loosen the coolant hose clamp
    • Twist off the coolant hose from the thermostat housing
    • Remove the two 8mm bolts from the thermostat housing
    • Pry up the housing with a flat blade screwdriver
    • Remove the gasket from the thermostat
    • Remove the thermostat
  6. step 6 :Installing the Thermostat
    • Vacuum out the thermostat housing
    • Insert the thermostat into the housing
    • Coat the gasket with motor oil
    • Press the gasket into the housing
    • Lace a bit of oil around the edge of the mating surface
    • Press the housing into place
    • Tighten the 8mm bolts to the thermostat housing
    • Connect the coolant hose to the housing
    • Slide the hose clamp into place
  7. step 7 :Installing the Throttle Body
    • Check that the o-ring is attached to the throttle mating surface
    • Insert the throttle body to the intake manifold
    • Tighten the four 8mm bolts to the throttle body
    • Torque the bolts to 89 inch-pounds
    • Connect the sensor
  8. step 8 :Reinstalling the Air Intake
    • Insert the intake into place
    • Tighten the hose clamps with a flat blade screwdriver
    • Connect the two breather lines
  9. step 9 :Reinstalling the Coolant Overflow Bottle
    • Connect the coolant overflow bottle into place
    • Tighten the 10mm bolts to the bottle
    • Connect the coolant hose to the radiator
  10. step 10 :Refilling the Coolant
    • Remove the radiator cap
    • Fill the radiator with coolant
    • Fill the radiator bottle up to the fill line
    • Run the vehicle
    • Check the coolant level

Tools needed for replacement

  • General Tools

    Rubber Mallet

    Drain Pan

  • Pliers, Cutters & misc Wrenches

    Channel-Lock Pliers

  • Ratchets & Related

    Socket Extensions

    Torque Wrench


  • Screwdrivers & Related

    Flat Blade Screwdriver

  • Sockets - Metric

    8mm Socket

    19mm Socket

  • Specialty Tools


  • Wrenches - Metric

    8mm Wrench

    19mm Wrench

Installation Video
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Hi, I'm Mike from 1AAuto. We've been selling auto parts for over 30 years! We're dedicated to delivering quality auto parts, expert customer service, and fast and free shipping, all backed by our 100% satisfaction guarantee. We've created thousands of videos to help you install our parts with confidence. That saves you time and money, so visit us at, your trusted source for quality auto parts.

In this video, we're going to show you how to replace your coolant thermostat. This is a 2006 Ford Explorer with the 4.6-liter V8. Pretty much the same for Explorer, as well as Mountaineer with this engine.

Hope you like the video. If you do, please click subscribe. Check out our thousands of other videos for all kinds of makes and models. And, for the part in this video, click the link down in the description. Visit for all your parts needs.

On the driver side of the radiator down below, there's a big 19 millimeter cap here, but ours is broken off. If you take the appropriate size Allen key, you can actually put it in to what might be remaining if you break yours and loosen. For various reasons, our vehicle doesn't have any fluid in it but, as you loosen this up, you'll get fluid flowing out of this hole here. Just make sure you have an appropriate container to catch the coolant. Once you've drained enough fluid, tighten the plug back up.

Even though we've drained the coolant down, I'm going to put an appropriate container below where we're working in case some coolant comes out. Just pull the hose off, twist, and pull. Then, two 10 millimeter bolts hold the bottle in place. Then the bottle just pulls up and out.

We're going to loosen these two clamps that hold it in place. Then unplug this line. You want to just pry this green tab up and pull it off. Then we'll just pull the tube off this side. There is another hose here. The same thing, push on the green tab. Twist and pull it up and off. Then remove the upper tube from there. Disconnect this lead. There’s a red safety tab that you pull back and then you can push in with a screwdriver the tab in there to push down and it disconnects.

On the throttle step motor, there's just a tab on the harness connection. Push it down and remove the four 8 millimeter bolts. Hold your throttle body in place. Remove those. The throttle bottle will come out. Sometimes it sticks a little more than that. If it is stuck, just tap on it from a couple different angles and pull it off. Disconnect this hose and it'll go that way. Push down on the tab. Use groove jaw pliers to squeeze this clamp. It actually has a little locking tab on it, so when you squeeze it, it'll stay. You can see it actually stays open, so you can just slide it up the hose some. Then twist on this hose and pull it off of the thermostat housing.

Two 8 millimeter bolts hold the thermostat housing in place. Use a wrench to loosen them. Then having a ratcheting wrench really helps the process. Actually, after I loosened them up, they started coming out easy, which actually made it more difficult because you have to kind of reach in behind there and thread them out with your fingers. After this point, screwdriver, try tapping on it. Comes up and out. Looks like somebody used some extra silicone on this one. Pull the thermostat up and out.

We're going to use a vacuum, a screwdriver, and a wire brush. We need to get all this residue out of the inside of the thermostat housing. You may not need to do this. You just need to install a new thermostat gasket from 1A Auto. You only need to do this if somebody used a bunch silicone on the vehicle like they did on this one.

Here’s a new thermostat from 1A Auto. If your vehicle is running hot or not circulating the coolant, a new thermostat will fix you up. Put it in. You want an O-ring gasket. I'm going to use and coat it with just a little bit of motor oil just to make sure that when I put everything together it slides into place correctly. If you're replacing your thermostat, make sure you use a new O ring from For some applications, we also sell thermostat housings from

We thoroughly cleaned it. Again, we're going to use just a little bit oil just to make sure it slides on to that O ring correctly. Put it down into place, and then we'll start our two bolts. To seat that O-ring correctly, you want to just make sure that you kind of tighten these up evenly. Don't tighten one all the way up and then the other one; get one seated a little bit and go to the other one. Just switch back and forth until you get it tight. Final tightening with the larger wrench. Make sure they're good and firm and then reattach this line. Make sure it clicks.

Put the hose back in place. You can just take that and hold the bottom of it and just tap it, and it'll go back in place. Just check and make sure the O-ring is in place for your throttle body. I always like to put the two top bolts in and then the two bottom bolts. I’m just going to get them hand tight first. You want to tighten these bolts to 89 inch-pounds. I like to start half way, so I've got it set to 45 inch-pounds. Now, I'll set it to 89 inch pounds and tighten them again.

We connect the leads. Make sure you lock that tab on. Then, we'll put our intake duct back in. Then tighten with a flat blade screw driver and reconnect these lines on here. We have one here. This double tab goes down into this clip here, so kind of look over it. Feed it down in. Make sure that goes in, and that goes right in place, and the bolt holes should line up. 10 millimeter bolts back in place. Reconnect the overflow hose to the radiator.

Then refill your radiator. Fill the radiator first, obviously while the vehicle is cool. Fill the radiator til you can see the coolant. Then fill your radiator bottle up to the fill cold line, which you can see on this side. You want to run the vehicle a few times and just check your radiator fluid each time.

Thanks for watching. Visit us at for quality auto parts, fast and free shipping, and the best customer service in the industry.

Tools needed for replacement:

    General Tools

  • Rubber Mallet
  • Drain Pan

  • Pliers, Cutters & misc Wrenches

  • Channel-Lock Pliers

  • Ratchets & Related

  • Socket Extensions
  • Torque Wrench
  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 8mm Socket
  • 19mm Socket

  • Specialty Tools

  • Vacuum

  • Wrenches - Metric

  • 8mm Wrench
  • 19mm Wrench

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