I've recently done some work on my a/c system: new dryer, repair high side hose, flushed system. Took car (84 300D) to have system purged and R134 added. Shop said vent temp down to 25 degrees, everything fine bring back in 1 week to check system for leaks. Took back 1 week later still ice cold. A/C tech found 1 tiny leak where hoses attach to compressor. I tried to repair leak by tightening bolt that holds hoses to comp. and stripped hole and all gases escaped. Rethreaded hole and put in longer bolt. Installed 1 can of R134 to make sure all seals holding. System ok. My question is: A/C very cold with this 1 can of R134, how is this possible? Should I go back and evacuate again and add refrigerant, or motor on without doing anything.