Engine 2014: General Subjects

1. A all air is purged from the pump and hoses using clean refrigeration oil or refrigerant vapor
2. B all air is purged from the pump and hoses using dry nitrogen
3. C all refrigerant vapor is purged from the compressor crankcase using dry nitrogen
4. D all refrigerant vapor is purged from the compressor crankcase using clean refrigeration oil

Tip: press A-D to answer