Sight Glass: Testing and Inspection
Sight Glass, Checking
WARNING: Automotive refrigerant containing CFC's is hazardous to the earth's atmosphere. To protect our environment, use an Underwriter's Laboratory (UL) approved refrigerant recovery/recycling unit such as Kent-Moore ACR3, or equivalent, whenever discharging an A/C system.
The sight glass (arrow) is located in the high pressure tube between the high pressure service valve and receiver drier.
- start engine and switch A/C ON
- during A/C compressor operation, sight glass should remain clear and bubble-free
If bubbles are present all the time, system is low on refrigerant
- check for leaks and recharge A/C system as necessary