Coolant Thermostat Housing Assembly For Mazda 3 5 6 MX5 Miata CX7
Direct replacement engineered to restore precise engine temperature regulation for affected Mazda sedans, hatchbacks, minivans, and convertibles.
This coolant thermostat housing assembly features a durable automotive-grade plastic construction designed to resist prolonged exposure to heated antifreeze and chemical additives. The unit maintains a hermetically sealed interface around the thermostat valve, preventing external leaks while enabling accurate thermal cycling. Built to strict manufacturing tolerances, it replaces numerous OE references including the LF70-15-170, LF50-15-170 / A / B / C, LFE5-15-170, and CJ5Z-8575-A codes. By addressing frequent failure points like cracked polymer bodies, stuck valve mechanisms, or degraded sealing surfaces, this component resolves overheating symptoms, rough cold starts, and dashboard warning indicators tied to restricted coolant circulation.
Benefits & Tips
- Verify the molded identification on your factory unit against the supported OEM reference codes before installation to guarantee correct bolt alignment and hose routing.
- Remove old gasket residues completely and inspect the engine block mating surface for pitting; applying a thin bead of high-temperature silicone prevents seepage under pressure.
- After fitting, refill the radiator, bleed trapped air from the system, and monitor the gauge through two complete drive cycles to confirm smooth valve actuation and stable operating temperatures.
Technical Specifications
- Construction Material: Reinforced automotive plastic
- Unit Weight: 250 grams
- Installation Position: Engine coolant thermostat assembly zone
- OEM Cross-Reference IDs: LF53-15-170/A/B, LF50-15-171, LG50-15-170, CJ5E-8575-AA, RT-1221, 5157411, plus additional manufacturer numbering variants
Package Includes
- One new coolant thermostat housing assembly
Installation Reminder
Fitment depends entirely on exact part number alignment across Mazda 3, Mazda 5, MX-5 Miata, and CX-7 platforms manufactured between 2007 and 2015. Physically compare this part to your existing hardware before ordering to ensure proper sealing and pressure retention.
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