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Do you need any sealer for the gasket when replacing thermostat?

In general, it is not recommended to use any sealant when replacing a thermostat. Most modern thermostats come with a rubber gasket or O-ring that creates a watertight seal when tightened. Applying sealant to the gasket can interfere with the proper seating of the thermostat and may cause leaks.

However, there are certain cases where using a sealant may be necessary, such as:

1.If the thermostat housing or the mating surface on the engine block is damaged or corroded, a sealant may be used to fill any gaps and create a better seal.

2.If the old gasket is damaged or torn, a sealant may be used to replace the gasket.

3.If the thermostat housing or the engine block is made of a material that is not compatible with the gasket material, a sealant may be used to improve the seal.

In such cases, it is important to use a sealant that is specifically designed for automotive applications and is compatible with the materials of the thermostat housing and the engine block. Follow the manufacturer's instructions for applying the sealant correctly to ensure a proper seal.

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