hi jloppy1, here is an underside pic of my sorted cooler, i chose to use my friends four poster ramps, much easier than using a jack etc, i think it is only possible from below although you could loosen the bolt from above to start with, it is only one big bolt through the cooler into the block, it has the black plastic on it at the front of the cooler, it should not be tight, or at least it should not be done up to tight when re tightening, it hes the torque written on it, when i loosened the bolt about a small glass worth of oil came out, but my engine was hot, the seals are either side of t