Honda K-Series Thermostat Case
Part Number: 19320-PNA-003

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Product Details

The Honda OEM Thermostat Housing is a genuine factory replacement designed for select Honda and Acura K20 and K24 engines, including the Acura RSX, Honda Civic Si, and Honda CR-V. This thermostat housing provides a secure mounting location for the thermostat while directing coolant through the engine's cooling system.

Over time, thermostat housings can develop cracks, corrosion, or damaged sealing surfaces that may lead to coolant leaks and overheating. Replacing a damaged housing helps restore proper coolant flow and maintain a reliable cooling system.

Manufactured to Honda's original equipment specifications, this thermostat housing offers precise fitment and factory-quality durability. It's an excellent replacement during thermostat servicing, cooling system repairs, and compatible K-Series engine builds.

Features

Genuine Honda OEM Part: Factory-quality construction and precise fitment.
K-Series Thermostat Housing: Designed for compatible K20 and K24 engine applications.
Reliable Coolant Routing: Directs coolant through the thermostat connection.
Secure Thermostat Mounting: Provides the factory mounting and sealing surfaces.
Direct Factory Replacement: Replaces the original thermostat case without modification on compatible vehicles.
Cooling System Reliability: Helps prevent coolant leaks caused by damaged housing surfaces.
Ideal for Engine Maintenance: Excellent for thermostat replacements, cooling system repairs, and K-Series rebuilds.
OEM Part Number: 19320-PNA-003.

Additional Information

Manufacturer: Honda / Acura
Part Number: 19320-PNA-003
OEM Description: Case, Thermostat (Nippon Thermostat)
Product Type: Engine Coolant Thermostat Housing
Position: Lower Thermostat Housing
Compatible Engines: Select K20 / K24
Installation Location: Engine Cooling System / Thermostat Assembly
Quantity: Sold Individually

Installation Notes

Always allow the engine to cool completely before servicing the cooling system. Drain the coolant to the appropriate level, remove the original thermostat housing, and thoroughly clean the mating surfaces before installation.
Inspect the thermostat, sealing gasket, coolant hoses, and surrounding connections for damage or deterioration. Follow Honda's factory service manual procedures for installation and fastener torque specifications.
After installation, refill the cooling system with the appropriate Honda-compatible coolant and properly bleed any trapped air.

Note:

Includes one genuine Honda thermostat housing. Thermostat, seals, coolant, mounting hardware, and additional cooling system components are sold separately unless otherwise specified.

For K20/K24 hybrid builds or custom engine swaps, verify compatibility with your thermostat, coolant hoses, and engine configuration before ordering.

Part Number:	19320-PNA-003
Brand:	Honda

WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. www.P65Warnings.ca.gov.

Vehicle Fitment

Year	Make	Model	Trim
2002	Acura	RSX	Base
2002	Acura	RSX	Type-S
2002	Honda	CR-V	EX
2002	Honda	CR-V	LX
2002	Honda	Civic	Si
2003	Acura	RSX	Base
2003	Acura	RSX	Type-S
2003	Honda	CR-V	EX
2003	Honda	CR-V	LX
2003	Honda	Civic	Si
2004	Acura	RSX	Base
2004	Acura	RSX	Type-S
2004	Honda	CR-V	EX
2004	Honda	CR-V	LX
2004	Honda	Civic	Si
2005	Acura	RSX	Base
2005	Acura	RSX	Type-S
2005	Honda	CR-V	EX
2005	Honda	CR-V	LX
2005	Honda	CR-V	SE
2005	Honda	Civic	Si
2006	Acura	RSX	Base
2006	Acura	RSX	Type-S
2006	Honda	CR-V	EX
2006	Honda	CR-V	LX
2006	Honda	CR-V	SE