3-way valve

The centre of the auxiliary cooling system on the Lotus Carlton is the 3-way valve. After hard driving and/or high temperatures when the engine is switched off, this vacuum actuated valve opens and with the help of the auxiliary water pump, this re-routes coolant flow through the cylinder head helping to prevent potential heat related damage to the head gasket and engine castings.


With age these can seize and leak without any obvious signs. If in doubt please feel free to contact us for advice and to book your car in for a coolant system health check.



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