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No need to replace the dryer, just leave the vacuum on for 8-12 hours. As far as the hoses go I have seen them work quite well with 134-a, even if they leak your A/C should last 1-2 years between recharges. Check the front condersor fan motor they are prone to failure. And when you recharge the system put a fan on the rear window blowing air towards the condensor this is very important the rear condensor needs the engine fan to pull air over it, with the rear lid open this does not happen and you will see the high presure go above normal and the a/c will not work correctly. I have got the a/c on old 911's to 41 degrees in the center vent with the outside temps in the lower 90's. If you work with this system enough you can make it run very well. Let me know