How to Change Thermostat with Housing Assembly 12-17 Jeep Wrangler

Introduction

This tutorial provides step-by-step instructions on how to replace the thermostat and housing assembly in a 2012-2017 Jeep Wrangler. A malfunctioning thermostat can lead to overheating or other engine issues, making this repair essential for maintaining vehicle performance.

Step 1: Gather Tools and Materials

Before starting the replacement, ensure you have the necessary tools and materials:

• Flat Blade Screwdriver
• 10mm Socket and Ratchet
• Trim Tool Set
• Anti-Freeze
• Gloves
• Drain Pan
• Floor Jack
• Jack Stands
• Funnel

Step 2: Remove the Engine Cover

• Locate the engine cover.
• Gently pull underneath the cover and slide it forward to remove it.

Step 3: Disconnect Hoses and Electrical Connectors

• Use a flat blade screwdriver to loosen the worm clamps on:
  • The throttle body.
  • The connecting hose.
• Remove the hose by sliding it off the connection.
• Disconnect the electrical connector from the thermostat housing.

Step 4: Drain the Coolant

• Remove the radiator cap to allow air to escape.
• Raise the vehicle using a floor jack and secure it with jack stands.
• Place a drain pan underneath the radiator, then open the coolant drain valve at the bottom of the radiator to collect the fluid.

Step 5: Remove the Thermostat Housing

• Use a 10mm socket to remove the two bolts securing the thermostat housing.
• Carefully pull the thermostat housing upwards to remove it. Check if the old seal remains on the engine; if so, peel it off.

Step 6: Prepare for the New Housing

• Clean the surface where the thermostat housing mounts using a rag.
• Use brake parts cleaner and a scuffed pad to remove any debris or corrosion, ensuring a smooth surface for the new housing.

Step 7: Install the New Thermostat and Housing

• Position the new thermostat and housing assembly onto the engine.
• Start the top and bottom bolts by hand, then use a torque wrench to tighten them to 105 inch-pounds.

Step 8: Reconnect Hoses and Clamps

• Reinstall the hose to the thermostat housing and secure the hose clamp. If the clamp is rusted, consider replacing it with a new worm clamp.

Step 9: Close the Radiator Drain

• Ensure the drain valve on the radiator is closed before adding new coolant.

Step 10: Bleed the Coolant System

• Locate the bleeder screw on the thermostat housing.
• Loosen the bleeder screw with a flat blade screwdriver until coolant begins to flow out, indicating that air is escaping from the system.
• Tighten the bleeder screw once you see a steady flow of coolant.

Step 11: Add New Coolant

• Using a funnel, pour the correct type of coolant into the radiator.
• Monitor the bleeder screw; if air bubbles appear, continue to add coolant until you see a steady flow.

Step 12: Reassemble Components

• Reattach the snorkel and tighten the two bolts.
• Reinstall the engine cover by sliding it into position and pressing down.

Step 13: Final Checks

• Start the engine and let it run for about 10 minutes while monitoring the coolant level and temperature.
• Turn on the vehicle’s heat to ensure that the coolant circulates properly.
• After the engine cools down, recheck the coolant levels in both the radiator and overflow tank, topping off as necessary.

Conclusion

Replacing the thermostat and housing assembly in your Jeep Wrangler is a straightforward process that can help prevent overheating issues. By following these steps carefully, you can successfully complete the repair. If you have any questions or need parts, visit 1AAuto.com for assistance.