Whilst the timing belt is off, it may well be worth while fitting a new water pump, they can weep and the belt would have to come off again.. Most folk can change the belt with the radiator in situ but I prefer to remove it and clean out all the crap from between the rad and the aircon condenser.. If the rad looks a bit scabby with the finns falling out or decomposing, then just change it for the price that they are..