Toyota Repair: 1992 GEO Prizm, 1992 geo prizm, oil pressure switch

Question
my car the air condition have a leak and i put on freon and it will work for one week and then the freon is gone.  how could i find out where is the leak or could this be fix cheap, please advice.  the other problem this car has the oil light is always on, is their anyway to get this fix, even after an oil change the light is always on.  thanks for all your help on this matter.

Answer
Without special equipment the only way to find a leak is be visual inspection, the leak may be at the condeser in front of the radiator or one of the freon line connections, freon has some oil in it so if there is a leak you can see the oil deposits, also check the freon lines where they go into the body, if nothing can be found I would recommend having a qualified a/c technician check it.
Try replacing the oil pressure switch to take care of the oil light, get the switc first so you can identify where it is on the engine block.