LLNSEAUTO Thermostat Housing Kit — Ford Explorer & Mercury 2002–2010 4.0L with Sensor, OE Fit

LLNSEAUTO Thermostat Housing Kit with temperature sensor is a direct-fit replacement that restores proper coolant flow and temperature monitoring on 2002–2010 Ford Explorer and Mercury Mountaineer V6 4.0L engines.

If your Explorer or Mountaineer is showing cooling system warnings, fluctuating cabin heat, or higher-than-normal idle temperatures, the thermostat housing and its integrated sensor are common wear points. This kit supplies a replacement housing plus a temperature sensor with O-ring and clip engineered to match OEM mounting points and electrical connections, helping you avoid leaks and inaccurate temperature readings.

What components are included and how do they match my vehicle?

The kit contains one thermostat housing and one temperature sensor pre-fitted with an O-ring and retention clip. It is designed to line up with factory bolt locations and connector types for a straightforward swap on compatible vehicles.

• Includes: 1x thermostat housing, 1x temp sensor with O-ring and clip
• Designed to match OEM fitment and fastener positions for 4.0L V6 engines
• Electrical connector and sensor thread size intended for plug-and-play replacement

Which model years and OE numbers does this fit?

This assembly fits a range of Ford and Mercury models equipped with the 4.0L V6 engine. Refer to OE references to confirm compatibility against your vehicle’s original part number.

• Compatible models: Ford Explorer (2002–2010), Explorer Sport Trac (2007–2010), Mercury Mountaineer (2002–2010)
• Common OE numbers: 2L2E9K478BA, 2L2Z8592AA, 2L2Z8592BA, 2L2Z8592BB, 2L5E9K478BA, 6L2Z8592FA, 902-860, RH148, SK121091
• Confirm part number against your vehicle’s under-hood label or service manual

How will this kit affect cooling performance and reliability?

Replacing a worn housing and faulty sensor helps preserve coolant circulation and improves engine temperature feedback to the vehicle’s control systems. The new O-ring and clip reduce leak risk where the sensor seats, and a proper housing seal prevents external coolant loss.

• Restores sealed coolant passage to prevent external leaks
• Fresh sensor improves temperature reading accuracy to the ECU
• Durable housing material resists cracking and heat cycling

How difficult is installation and what should I prepare?

Installation is moderate and typically within the skill set of experienced DIYers or professional technicians. You’ll need basic hand tools, a drain pan to capture coolant, and a replacement coolant or top-up to refill and bleed the system after installation.

• Tools: ratchet, sockets, screwdrivers, coolant catch pan
• Plan to drain partial coolant, replace the housing, then refill and bleed air pockets
• Recommended to inspect surrounding hoses and clamps during replacement

Who this kit is for: Owners and technicians maintaining 2002–2010 Ford Explorer, Explorer Sport Trac, or Mercury Mountaineer vehicles with the 4.0L V6 who need an OE-compatible thermostat housing and temperature sensor. Choose this LLNSEAUTO kit if you want a direct-fit replacement that includes the sensor, O-ring and clip, a detailed OE reference list for verification, and a 1-year satisfaction warranty to back the purchase.