I picked up my 1980 series 3 2.25 petrol from landy specialist garage today following the replacement of the front crank oil seal and crank pulley. The engine started to get hot this afternoon with the temp guage creeping up towards the red so this evening I checked the radiator coolant level and it appears fine but I noticed coolant dripping onto the floor. On further inspection I noticed that when turned off and stationary there is a slow dribble of coolant emanating from a hole on the underside of the the casing on the engine side of the fan belt pulley. The hole looks like it is supposed to be there. Any ideas why coolant is dribbling out of this hole and apparently causing my temp guage to creep towards the red? Thanks