Description Reviews Has coolant been disappearing? But you can't see where it's going? There are three common places on the Generation 1 MINI Cooper S that it could be going. The expansion tank is leaking, the thermostat is leaking, or the water pump is failing. But it can also be the o-ring that is behind this flange It's very hard to see up into this water pump and you need to be under the car, take of the under tray, and look up with a flashlight. You will see a green caked up area under the pump and on the block. If it's really bad it'll make it all the way down to the bottom of the oil pan.Normally you can replace just the o-ring, but if it's been leaking for a while, and has caused pitting of the aluminum flange it will need to be replaced so that the water pump will seal against it. This is a bigger job that will take some time, and we highly recommend a Bentley manual, but basic hand tools will get it done.
On Sale! Quick view Choose Options URO MINI Cooper Water Pump Friction Wheel AFTER Was: $200.50 Now: $101.83