Honda Acura RSX Civic Si K20 K24A1 Upper Coolant Housing with Built-In Filler Neck and Thermostat - Aluminium

Product Overview

This aluminium upper coolant housing features a built-in filler neck and includes a thermostat, according to the title. It is listed for Honda K-Series K20 and K24A1 engines in the Acura RSX and Honda Civic Si. A housing with an integrated filler is popular in K-Series swaps and builds where the factory radiator filler position is awkward or a cleaner layout is wanted.

Key Features and Benefits

• Upper coolant housing
• Built-in filler neck
• Thermostat included, per the title
• Aluminium construction
• Listed for K20 and K24A1 engines

Vehicle Compatibility

The supplier lists K-Series K20 and K24A1 engines in the Acura RSX and Honda Civic Si, with year fields of 2002-2006. Engine sub-variants and radiator hose routing are not detailed. Fitment is supplier-stated and must be confirmed for your engine and swap layout before ordering.

Product Specifications

• Product type: upper coolant housing with filler and thermostat
• Material: aluminium
• Engine family: K-Series (K20, K24A1)
• Size: standard
• Packed size: 27 x 11 x 9 cm
• Packed weight: approximately 0.9 kg

Installation and Usage

Allow the engine to cool fully and drain the coolant. Remove the factory upper coolant housing and thermostat, clean the mating surface and fit the new housing with a fresh gasket or O-ring and the thermostat correctly oriented. Torque the bolts evenly, reconnect the hoses, refill with the correct coolant and bleed air from the system. Run the engine to temperature and check for leaks.

Package Contents

Upper coolant housing with thermostat, as described. Gaskets, cap and hardware have not been itemised by the supplier.

Important Fitment Notice

Please send us your VIN and engine details before ordering so we can help confirm fitment. Images are for reference only. Cooling system parts must be secure and leak-free to pass a Warrant of Fitness in New Zealand. Our team is happy to help with any questions about this part. Please include your engine code.