Honda Cooling System Thermostat OEM – 06193-59B-306 – Civic 1.5 Turbo / CR-V 1.5 Turbo

Honda Cooling System Thermostat – 06193-59B-306

Genuine Honda OEM thermostat designed for the L15B-series engines fitted in 1.5 Turbo variants. The thermostat regulates coolant flow between the engine and radiator, maintaining the optimal operating temperature of the engine. It opens at 78°C, in line with Honda's factory specification for these engines. The set includes the thermostat and gasket.

Applications

• Honda Civic X sedan (2017–2021) 1.5 Turbo – 4D
• Honda Civic X hatchback (2017–2021) 1.5 Turbo – 5D
• Honda CR-V V (2019–2023) 1.5 Turbo

L15B-series engines found in the above models: L15B7, L15BA, L15BE. Before ordering, verify the OEM part number in the parts catalogue for your specific model, year and market (Europe, Japan, North America) – not every engine variant is available in all models and on all markets.

OEM Reference Numbers

• 06193-59B-306 – current part number

The number listed above is a Honda OEM reference number. Use it to verify compatibility in the official Honda parts catalogue or with your OEM parts distributor.

Signs of Thermostat Failure

• Engine takes a long time to warm up or never reaches normal operating temperature – thermostat stuck open
• Engine overheats – thermostat stuck closed
• Irregular temperature fluctuations on the gauge – thermostat opening and closing erratically
• Increased fuel consumption and emissions – engine running too long below optimal temperature
• Coolant leak around the thermostat housing – damaged gasket or housing

A faulty thermostat should be replaced without delay. An engine running constantly below operating temperature uses more fuel and wears faster. An overheating engine risks serious damage – warped cylinder head, blown head gasket or engine seizure.

Installation and Service Tips

• Allow the engine to cool completely and release cooling system pressure before removing the thermostat.
• Always fit a new gasket when replacing the thermostat – reusing the old gasket risks a coolant leak.
• After installation, top up the coolant to Honda specification (Honda Genuine Coolant 5L or Honda Genuine Coolant 1L) and bleed the cooling system.
• Start the engine and check for leaks and correct temperature gauge behaviour – the needle should reach its normal position within a few minutes of driving.

FAQ – Frequently Asked Questions about Honda Thermostat 06193-59B-306

At what temperature does this thermostat open?
Thermostat 06193-59B-306 opens at 78°C, in line with Honda's factory specification for L15B-series engines fitted in 1.5 Turbo variants.

Does the thermostat come with a gasket?
Yes, part number 06193-59B-306 is supplied as a set – the thermostat together with a gasket. The thermostat housing is not included and is sold separately. While working on the cooling system, it is also worth replacing the coolant drain plug washer – this is a single-use component.

Does this thermostat fit the CR-V 1.5 Turbo produced before 2019?
The CR-V V with the 1.5 Turbo engine was introduced to different markets at different times. For model years before 2019, we recommend verifying the OEM part number in the parts catalogue for your specific VIN and market.

How often should the thermostat be replaced on the L15B engine?
There is no fixed replacement interval for the thermostat – it should be replaced when symptoms of cooling system malfunction appear, or opportunistically during other work in the area, such as a coolant change or cooling system repair.