That is a repair that (IMHO) is worth farming out for two reason, other than the access difficulties you have already noticed:
1) removing the existing refrigerant really should only be done using recovery equipment ($$$$) and unless done carefully and just right, it is very hard to determine how much of the original OIL charge will remain in the system while venting, and
2) prior to recharging the refrigerant, the system needs to have a deep vacuum pulled on it to remove all air and moisture, even if the system is only opened briefly. This requires a vacuum pump ($$$$).
- Jay
1) removing the existing refrigerant really should only be done using recovery equipment ($$$$) and unless done carefully and just right, it is very hard to determine how much of the original OIL charge will remain in the system while venting, and
2) prior to recharging the refrigerant, the system needs to have a deep vacuum pulled on it to remove all air and moisture, even if the system is only opened briefly. This requires a vacuum pump ($$$$).
- Jay