HELLO ... ALWAYS, BUT ALWAYS THAT THE SYSTEM IS OPENED, AND ABOVE ALL WHEN THERE ARE ANSWERS OF MOISTURE AND / OR DIRT IN THE SYSTEM YOU HAVE TO CHANGE FILTER AND OIL, THE CORRECT PROCESS WOULD BE: ELECTRONICALLY DISCONNECT THE MOTOCOMPRESSOR, DISMANTLING THE HIGH AND LOW PRESSURE PIPES, REMOVE THE MOTOCOMPRESSOR AND EMPTY ITS OIL CONTENT IN A BATEA OR CONTAINER TRAY TO THEN MEASURE THE AMOUNT THAT IT WAS MANUFACTURING. WELDING VALVES, ONE AT THE EXTREME OF THE CAPILLAR ONE AT THE END OF THE CONDENSER, TO CIRCULATE SOME CLEANING AGENT (141B OR THINNER) PUSH IT THROUGH THE SYSTEM WITH NITROGEN AT LOW PRESSURE TO UNDERSTAND AND CLEAN THE CAPILLATOR, REAPPUT LEAVE CLEAN, SWEEP WITH NITROGEN PLACE MOTOCOMPRESSOR IN YOUR PLACE, RESOLVE PIPES AND FILTER, VACUUM, PLACE THE NEW OIL (TO REFRIGERANT TO USE) IN A CONTAINER, THEN MAKE ENGINE OIL THROUGH MOTORCYCLE , MAKE A VACUUM AGAIN, LET REST, ENTER NITROGEN TO ABOUT 50 PSI APPROX TO REVIEW SEALING AND LEAKS, PERFORM THE VACUUM AGAIN (THIS IS THE DEFINITIVE) AND THEN PROCEED TO REFRIGERANT RECHARGE. IF THERE ARE ANSWERS OF HUMIDITY IN THE SYSTEM IT IS RECOMMENDED TO USE THE TRIPLE EMPTY TECHNIQUE, WHICH CONSISTS OF MAKING A LITTLE REFRIGERANT TO THEN RETURN TO BE EMPTY, THEN AGAIN TO REFRIGERANT, THEN AGAIN TO DO IT AGAIN. THEN MAKE A DEFINITIVE VACUUM TO CARRY UP A COOLANT AND TO OPERATE, IF YOU FOLLOW THESE STEPS YOU WILL NEVER HAVE A TOTAL OR PARTIAL OBSTRUCTION PROBLEM