KPALAG Engine Coolant Thermostat for Ford 4.6L/5.4L/6.2L – 192°F Opening, Brass Shell with O-ring

KPALAG Engine Coolant Thermostat is a direct-fit replacement thermostat assembly with O-ring engineered to open at 192°F for Ford 4.6L, 5.4L and 6.2L engines.

This thermostat assembly delivers a precise thermal response using a paraffin expansion element inside a brass shell, stainless steel internals, and a machined guide to replace worn factory units. It comes complete with an O-ring and cross-references common part numbers so you can restore proper coolant flow and engine warm-up behavior on compatible Ford trucks, vans and SUVs.

How does this thermostat control engine temperature?

The KPALAG unit uses a paraffin-filled sensing element that expands predictably when it reaches its calibrated activation point. That expansion drives a piston to open the valve and allow coolant circulation, maintaining engine operating temperature without electronic controls.

• Opening temperature calibrated to 192°F for consistent warm-up
• Paraffin expansion element provides steady, repeatable movement
• Mechanical piston-driven valve avoids electrical failure modes

What materials and construction improve reliability?

This thermostat pairs a brass outer shell and guide with stainless steel piston, spring frame and bridge components to resist corrosion and accelerate heat transfer. The robust materials mean faster response to temperature changes and longer service life compared with lower-grade replacements.

• Brass shell and guide for quick heat conduction
• Stainless steel internals for strength and corrosion resistance
• Precision assembly reduces sticking and improves seal life

Which vehicles and part numbers does it replace?

The KPALAG assembly is designed as a direct-fit for many Ford V8 4.6L, 5.4L and 6.2L applications across trucks, vans and SUVs. It lists common replacement numbers to help confirm compatibility before purchase.

• Fits F-150, F-250, F-350 Super Duty, Expedition, Explorer, Mustang and more
• Compatible years include F-250/F-350 (1999–2020), F-150 (1997–2014), E-Series vans (2003–2014), Excursion (2000–2005)
• Replaces RT1254 and 7L3Z-8575-E reference numbers

What comes in the box and how easy is installation?

Each package contains the thermostat assembly and an O-ring for a complete seal; installation follows the factory procedure and typically requires standard hand tools and coolant handling precautions. Because it’s a mechanical, direct-fit part, the swap is straightforward for DIYers or technicians familiar with the vehicle cooling system.

• Includes 1 thermostat assembly and 1 O-ring
• Direct-fit design reduces modification or machining needs
• Works with existing coolant hoses and housing on compatible models

Who is this for: Drivers and mechanics who need a dependable, OEM-style thermostat for Ford 4.6L, 5.4L and 6.2L engines—especially owners of F-150, Super Duty, Expedition, Explorer, Mustang and E-Series vans looking for a long-lasting mechanical replacement. Choose the KPALAG thermostat when you want a corrosion-resistant brass body, stainless steel internals, and a paraffin-based sensing element calibrated to open at 192°F, supplied with a sealing O-ring and cross-referenced part numbers for easy fitment verification.