FETUSI Thermostat Housing Assembly for Jeep Wrangler JK 2012-2018 3.6L — Aluminum, 180F Thermostat

FETUSI's aluminium thermostat housing is a direct-replacement cooling component designed for Jeep Wrangler JK 2012–2018 3.6L engines, featuring a 180°F thermostat and a durable cast-aluminium body.

Built to outlast the original plastic housings, this assembly restores reliable coolant control and helps maintain steady operating temperatures during daily driving, trail use, or towing. It replaces factory part numbers 5184655AD and 5184651AH and installs in place of the OEM unit for a straightforward swap. The component is manufactured from high-strength aluminium alloy to resist corrosion and cracking that commonly affect plastic housings over time.

How does this housing improve cooling system reliability?

By using a cast-aluminium construction instead of plastic, the housing is inherently more resistant to heat cycling and impact. The integrated thermostat opens at 180°F (85°C) to regulate coolant flow and help the engine reach and maintain its intended temperature range faster and with less fluctuation.

• Durable aluminium alloy resists corrosion and cracking compared to plastic.
• Factory-fit design ensures consistent coolant routing and sealing.
• 180°F thermostat setting optimizes normal operating temperature control.
• Direct replacement for part numbers 5184655AD and 5184651AH.

Will this part fit my Jeep Wrangler JK and how easy is installation?

This assembly is made specifically for Jeep Wrangler JK models from 2012 through 2018 with the 3.6L engine. It is a bolt-on replacement intended to match OEM mounting points and coolant connections so installation is straightforward for a competent DIYer or a professional mechanic.

• Compatibility: 2012–2018 Jeep Wrangler JK, 3.6L engine.
• Direct-fit design uses original mounting locations and hoses.
• No vehicle modifications required; typical installation uses standard hand tools.
• Recommended to replace coolant and inspect hoses/gaskets during installation.

What performance or maintenance benefits can I expect?

Swapping to a stronger aluminium housing reduces the likelihood of leaks, warping, or breakage that can accompany plastic units, which helps lower repair frequency and expense. Improved heat dissipation and stable thermostat operation support consistent engine temperature under load, such as towing or off-road use.

• Lower risk of cracking or leak-related failures compared to plastic housings.
• Improved heat transfer from the engine to the cooling system.
• Helps maintain steady coolant flow during heavy-duty conditions.
• Can reduce unscheduled maintenance and part replacements over time.

What warranty and post-purchase support does FETUSI provide?

The product is backed by a one-year warranty covering manufacturing defects. FETUSI offers customer support to answer fitment or installation questions and to help resolve any issues that arise after purchase.

• 1-year limited warranty against manufacturing defects.
• Customer support available for fitment and installation help.
• Replacement or assistance options provided when valid warranty claims arise.

Who is this for: This aluminium thermostat housing is intended for Jeep JK owners and mechanics who want a long-lasting replacement for the factory thermostat housing on 3.6L engines. It’s particularly well suited to drivers who tow, use their Wrangler off-road, or who prefer metal cooling components for greater durability and reduced long-term maintenance. If you need a direct-fit swap for part numbers 5184655AD or 5184651AH and want a robust, corrosion-resistant solution, this FETUSI assembly is built for that purpose.