Quinton Hazell Engine Coolant Thermostat • QTH461

Quinton Hazell QTH461 Engine Coolant Thermostat

Replacement Quinton Hazell engine coolant thermostat for Mazda MX-5 MK1/NA and MK2/NB/NB-FL 1.6 and 1.8 petrol models, including the 1.8i Turbo, as listed in the compatibility table.

The thermostat regulates coolant flow between the engine and radiator, helping the engine reach and maintain its correct operating temperature. QTH461 is designed as an aftermarket replacement for the original component.

This thermostat has a published opening temperature of 88°C. A faulty thermostat can cause slow engine warm-up, excessive coolant temperature, poor heater performance or unstable operating temperature.

• Part type: Engine coolant thermostat
• Location: Engine cooling system
• Opening temperature: 88°C
• Diameter: 52 mm
• Height: 22.5 mm
• Gasket / seal included: No
• Quantity per vehicle: 1
• Quantity supplied: 1 thermostat
• Brand: Quinton Hazell
• Part No.: QTH461
• Designed as an aftermarket replacement for the original part on the applications listed

Fitment advice: QTH461 is catalogued across the Mazda MX-5 MK1/NA and MK2/NB/NB-FL range shown in the compatibility table. The thermostat is supplied without a gasket or seal, so the appropriate sealing component should be obtained separately where required. For imported, modified or previously repaired cars, matching the part number or component style on the part being replaced is recommended.

Other items to consider: Thermostat gasket / seal, coolant, radiator hoses, radiator cap and water pump.

Useful tools / consumables: Correct-specification coolant, suitable hand tools, drain container, hose-clamp pliers and cleaning materials for the thermostat mating surfaces.

Difficulty guide: DIY Difficulty: Moderate. Replacement requires partial draining of the cooling system, access to the thermostat housing and correct refilling and bleeding of the cooling system.

Why Quinton Hazell? Quinton Hazell is a long-established automotive aftermarket brand, offering dependable replacement parts for servicing and repair. Its components are designed as practical aftermarket replacements for the original parts on the applications listed.

What’s in the box: 1 × Quinton Hazell QTH461 engine coolant thermostat. Gasket / seal not included.

Installation notes: Allow the engine to cool fully before opening the cooling system. Clean the thermostat housing and mating surfaces before installation, fit the correct sealing component, refill with suitable coolant and bleed the cooling system thoroughly after installation.