Description Reviews We see a lot of leaky gen 2 thermostats here at the shop. We are almost installing one a week it seems. We don't see as many of the N18s going bad as we do the N14 units, but we still see some. Keep an eye on your coolant tank when you are checking your oil. If it's low then you need to look down the driver's side of the motor (right next to valve cover) to see if coolant is pooling around the top brown sensor. You can also get a SES light when the sensor gets the wrong readings as well as a hard start. This part will actually stop the car from starting in certain conditions because the sensor is giving the car the wrong info (extreme temps). This is an electric operated thermostat assembly, so your car's ECU controls how it opens and closes. This thermostat is a brand new MINI OEM part with a 2 year unlimited miles warranty from MINI. This is the latest and greatest design and will fit all Cooper or Cooper S's with the N16 or N18 motors starting in 02/13 to the end of the car's life cycle (it may also fit some other motors as well). Since this is the latest design, you might need a new updated wire harness that we also carry here. For all R55 Clubmans R56 Hardtops, R57 Convertibles, R58 JCW Coups & Coopers, R59 JCW Roadsters & Coopers, R60 Cooper Countryman, R61 Cooper Paceman. Don't forget some quality fluid!