seabs

Hi please let me know what it is...! I have an 03 TD Ghia with a leak... I think... the revs dip when I put the aircon on so I presume the pump is working... but I can't see a leak... the climate flashes but it has done ever since I replaced it because the old one had coke poured in it!! I am tempted to change the condenser myself... anyone had a go at this? Or just replaced the O rings?