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R134a Visual Inspection Sight Glass / R1234yf Visual Inspection Sight Glass
OPERATING INSTRUCTIONS
WARNING
• WEAR GOGGLES!!
• AVOID CONTACT WITH REFRIGERANT
PREPARING THE SIGHT GLASS
When Using Vacuum from a Recycling
Machine
1. Connect both the red and blue hoses
supplied to the corresponding end of the
sight glass.
2. Connect the blue low side hose and
coupler from your RRR machine to the low
side fitting on the blue side of the sight
glass.
3. Open both ball valves on each side of the
sight glass.
4. Run a vacuum for 3 minutes from the
control panel on your RRR machine. This
will remove any atmosphere from the
sight glass to allow for an accurate test.
5. Disconnect the low side RRR machine
coupler from the sight glass when vacuum
run time is completed.
6. Go to using the sight glass section.
When Using Vacuum from a Vacuum Pump
1. Connect the red hose supplied to the red
side of the sight glass.
2. Connect the blue hose and blue coupler
supplied to the coupler fitting on the blue
side of the sight glass.
3. Connect the other end of the blue hose to your vacuum pump.
4. Open the red high side ball valve, leave the blue low side ball valve closed.
5. Run your vacuum pump for 3 minutes. This will remove any atmosphere from the sight glass to allow for an
accurate test.
6. Disconnect the blue hose from the vacuum pump when vacuum time is completed. Disconnect the blue coupler
from the sight glass. The fittings on the blue hose and coupler both have auto shutoff’s which will maintain the
vacuum created in the sight glass and hoses.
7. Connect the blue low side hose to the blue side of the sight glass.
USING THE SIGHT GLASS
1. Close both ball valves on the sight glass.
2. Connect the red coupler to the high side of the AC system.
3. Connect the blue coupler to the low side of the AC system.
4. Start the vehicle and turn the AC system on.
5. Hold the sight glass in a vertical position.
6. SLOWLY open the red side ball valve
7. When the sight glass is ¼ full of liquid refrigerant, close the red side ball valve.
8. Allow the refrigerant to stabilize.
9. Check the color of the refrigerant using the chart below. Check for any debris in the refrigerant.
We ar S afe t y Go ggle s
We ar S afe t y Go ggle s
R134a Visual Inspection Sight Glass
R1234yf Visual Inspection Sight Glass
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POSSIBLE CONTAMINANTS THAT CAN BE SEEN IN THE INSPECTION GLASS INCLUDE:
CARBONIZED OIL PARTICLES When oil is exposed to high temperatures
RUBBER PARTICLES Aggressive acids penetrating rubber parts
MOISTURE Leaks, incorrect or insufficient vacuum or wrong/inferior quality additives
METAL SLIVER/CHIPS Compressor seizure or metal parts abrasion
AGGRESSIVE ACIDS Chemical reaction between moisture and refrigerant/oil or incorrect oil mixtures
VARIOUS PARTICLES Soiled compounds created from using poor quality or incorrect additives such as leak
stop agents, UV dye or oil mixture composites
UNACCEPTABLE CONDITIONS
These conditions when viewed in the inspection glass are an indication of serious system/component issues
DARK GREEN
Excessive UV dye in the system
RUBBER/PLASTIC COMPOUNDS
Aged seals, strong additives reacting
with seals and hoses, receiver dryer
failure or too much dryer wear
RED/ORANGE
Excessive red leak tracing dye in the
system
BUBBLE/PEARLS
Moisture in the system, contamination
caused by insufficient quality additives,
incorrect vacuum pulled during
previous services
LIGHT BROWN
System or compressor subjected to
overheating
GEL-LIKE, CRYSTALLIZED TEXTURE
Insufficient quality leak stop agents
reacting with refrigerant/oil or UV dye,
no/incorrect vacuum pulled before leak
stop applications
DARK BROWN OR BLACK
System or compressor subjected to
excessive overheating
CREAM/UNCLEAR TEXTURE
Aggressive flushing agent residues
reacting with aluminum and teflon
coating on the compressor’s parts,
incorrect flushing and vacuum pulled
after flushing
METAL CHIPS/PARTICLES
Compressor seizure caused by oil
starvation or incorrect lubrication
IMBALANCED LIQUIDS MIXTURE
Application of universal/incorrect oils,
unbalanced, non-homogeneous mixture
of various oils
ACCEPTABLE CONDITIONS
These conditions when viewed in the inspection glass are an indication that no issues are present
ACCEPTABLE CONDITION
Pure mix of refrigerant and lubricant
ACCEPTABLE CONDITION
Appropriate mix of refrigerant, lubricant
and UV dye
CLEARING THE SIGHT GLASS OF REFRIGERANT
1. To put the refrigerant back into the AC system, first turn off the AC system and vehicle.
2. Remove the high side red coupler from the high side of the vehicle.
3. Turn on the vehicle and the AC system.
4. Open the red high side ball valve on the sight glass.
5. SLOWLY OPEN THE BLUE LOW SIDE BALL VALVE ON THE SIGHT GLASS.
6. Wait for 1 minute after the liquid refrigerant is removed from the sight glass. This allows any refrigerant in the blue
hose to enter the AC system.
7. Remove the blue low side coupler.
8. Turn off the AC system and vehicle.
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PARTS LIST
R134a Visual Inspection Site Glass
Item # Part # Description
1. 53375 Refrigerant Oil Visual
Inspection Sight Glass
2. 82274 Low side, 1/4” (7/16”-20)
x 13 mm retrofit adapter
3. 53376-601 60” Blue R134a Charging
Hose
4. 53376-603 60” Red R134a Charging
Hose
5. 66234 Economy High Side
Coupler
6. 66334 Economy Low Side
Coupler
7. 53376-PB Plastic Box (not pictured)
R1234yf Visual Inspection Site Glass
Item # Part # Description
8. 53375 Refrigerant Oil Visual
Inspection Sight Glass
9. 84274 1/4 fl-f x 17 mm-m
R1234yf adapter with
valve core
10. 53376-601YF 60” Blue R1234yf
Charging Hose
11. 53376-603YF 60” Red R1234yf
Charging Hose
12. 67434 R1234yf High Side Quick
Coupler
13. 67534 R1234yf Low Side Quick
Coupler
14. 53376-PB Plastic Box (not pictured)
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For parts or service contact the service department: 1-888-825-6989
WARNING: This product can expose you to chemicals including Di (2-ethylhexyl) phthalate, lead and lead compounds,
which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more
information go to www.P65Warnings.ca.gov
DRAFT
