🔧 Encore - Thermostat Replacement

On your Encore, the thermostat controls engine temperature by regulating coolant flow. When it sticks open/closed or leaks, you can get overheating, slow warm-up, or coolant loss. This job is mainly about safely draining some coolant, swapping the thermostat housing assembly, and refilling/bleeding the cooling system.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

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⚠️ Safety & Precautions

• ⚠️ Never open the coolant tank when hot; hot coolant can spray and burn.
• ⚠️ Support the vehicle with jack stands on a solid, level surface—never rely on a jack alone.
• ⚠️ Keep coolant off belts/electrical connectors; wipe spills immediately.
• ⚠️ Dispose of old coolant properly; it’s toxic to people and pets.
• 🔋 Battery disconnect is not required, but keep tools clear of the radiator fan—it can turn on unexpectedly.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Drain pan (10-quart minimum)
• Funnel
• Ratchet (3/8")
• Socket set (8mm, 10mm, 13mm)
• Torx bit set (T20, T25, T30)
• Extension set (3", 6")
• Pliers (hose clamp pliers)
• Trim clip removal tool
• Pick tool
• Torque wrench (inch-pound and ft-lb)
• Shop rags
• Flashlight

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Thermostat housing assembly (with seal) - Qty: 1
• Dex-Cool coolant (50/50 premix) - Qty: 1-2 gallons
• Hose clamps - Qty: 1-3
• Cooling system bleed screw O-ring (if equipped) - Qty: 1

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Let the engine cool fully (at least 1–2 hours).
• Set your heater to HOT later during bleeding (this helps purge air from the heater core).
• Assumption: Thermostat is the common 1.4L turbo housing-style unit near the front/side of the engine.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise the front and remove the lower splash shield

• Use a floor jack (rated 3-ton minimum) to lift the front of your Encore and set it on jack stands (rated 3-ton minimum).
• Use a trim clip removal tool and Torx T20/T25 (varies by fastener) to remove the lower splash shield/undertray.

Step 2: Drain enough coolant

• Place a drain pan (10-quart minimum) under the radiator area.
• Slowly loosen the coolant surge tank cap to relieve any leftover pressure.
• Open the radiator drain (if equipped) using the appropriate socket set (8mm, 10mm, 13mm) or by hand, and drain 1–2 gallons (enough so the level is below the thermostat).
• If there’s no drain, use pliers (hose clamp pliers) to loosen the lower radiator hose clamp and carefully crack the hose loose to drain into the pan.
• Tip: Keep rags ready; coolant spills fast.

Step 3: Remove the air intake ducting for access

• Remove the engine cover (it typically pulls up). Use a flashlight to locate the rubber grommets.
• Use an 8mm socket to loosen the intake hose clamp(s).
• Unclip or remove the intake duct/resonator as needed using a Torx T20/T25 and/or 10mm socket.

Step 4: Locate the thermostat housing and disconnect hoses/connectors

• Find the thermostat housing where the main coolant hose meets the engine.
• Use pliers (hose clamp pliers) to slide the hose clamps back, then twist and pull the coolant hoses off the housing.
• If an electrical connector is present (coolant temperature sensor), press the lock tab and unplug it by hand. Use a pick tool gently if the tab is stubborn (don’t break it).
• Catch any remaining coolant with the drain pan and shop rags.
• Definition: A hose clamp plier is a plier that locks a spring clamp open.

Step 5: Remove the thermostat housing

• Use a ratchet (3/8"), extension set (3", 6"), and 10mm socket to remove the thermostat housing bolts.
• Pull the housing straight off. If it’s stuck, gently wiggle it—don’t pry hard against plastic surfaces.
• Remove the old seal/O-ring if it stayed on the engine. Use a pick tool carefully.

Step 6: Install the new thermostat housing

• Wipe the mating surface clean with shop rags. No old seal material should remain.
• Install the new housing with its new seal in place.
• Hand-start all bolts to avoid cross-threading.
• Use a torque wrench (inch-pound and ft-lb) to tighten the housing bolts evenly: Torque to 10 Nm (89 in-lbs).
• Reconnect coolant hoses and reposition clamps using pliers (hose clamp pliers).
• Reconnect any electrical connector(s) until they click.

Step 7: Reinstall intake parts and undertray

• Reinstall the intake ducting using an 8mm socket and Torx T20/T25 as needed.
• Reinstall the lower splash shield using the trim clip removal tool and Torx bits (T20, T25, T30) as equipped.

Step 8: Refill and bleed the cooling system

• Lower the vehicle off the jack stands using the floor jack.
• Using a funnel, fill the surge tank with Dex-Cool coolant (50/50 premix) to the correct level.
• If your system has a bleed screw near the upper hose/thermostat area, loosen it using the appropriate socket set (8mm, 10mm, 13mm) until coolant (no bubbles) flows, then snug it closed.
• Start the engine and let it idle with the heater set to HOT.
• Watch the temperature gauge and check for leaks with a flashlight.
• As the engine warms up, top off the surge tank as needed (don’t overfill).
• Once the radiator fan cycles and you get steady heat from the vents, shut the engine off and let it cool, then recheck and adjust the coolant level.

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✅ After Repair

• With the engine running, inspect around the thermostat housing and hose connections for any seepage using a flashlight.
• Verify normal operating temperature on the gauge and strong cabin heat.
• After your first drive and a full cool-down, recheck coolant level and top off if needed.
• If a check engine light appears, you may need a scan to confirm no coolant temp/thermostat codes remain.

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💰 DIY vs Shop Cost

Shop Cost: $350-$700 (parts + labor)

DIY Cost: $60-$180 (parts only)

You Save: $170-$640 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.