A/c Compressor Refrigerant Oil Checking Buick Century V

REFRIGERANT OILS

Note. For COMPRESSOR APPLICATION and REFRIGERANT OIL & REFRIGERANT SPECIFICATIONS tables, see the A/C COMPRESSOR SERVICING article in the AIR CONDITIONING & HEAT section. DO NOT exceed A/C system refrigerant oil capacity when servicing system.

Use only new, pure, moisture-free refrigerant oil in A/C systems. This oil is highly refined with a very low moisture content. Oil container must be tightly closed when not in use, or moisture from air will be absorbed into refrigerant oil.

Refrigerant R-12 based systems use mineral oil, while R-134a systems use synthetic/Polyalkylene Glycol (PAG) oil. Using a mineral oil based lubricant with R-134a systems will result in A/C compressor failure due to lack of proper lubrication.

Use only specified oil for the appropriate system and A/C compressor. Always check the underhood A/C specification label or A/C compressor label before adding refrigerant oil to A/C compressor/system. The following types of R-134a refrigerant oil are currently available.

GM

PAG Refrigerant Oil (12345923).

Note. Synthetic/PAG oil absorbs moisture very rapidly, 2.3-5.6 percent by weight as compared to a mineral oil absorption rate of .005 percent by weight.

DISCHARGING SYSTEM

If compressor has stem-type service valves, it can be isolated and removed without discharging entire system. Otherwise, discharge A/C system using approved refrigerant recovery/recycling equipment before loosening any fittings.

DISCONNECTING LINES & FITTINGS

After system is discharged, carefully clean area around all fittings to be opened. Always use 2 wrenches when loosening or tightening fittings. Some refrigerant lines are connected with a coupling. Special tools may be required to disconnect lines. Cap all openings as soon as lines are removed. DO NOT remove caps until ready to connect lines and fittings.

Note. All R-134a based systems use 1/2-16 ACME threaded fittings. Ensure all replacement parts match the connections of the system being worked on.

CONNECTING LINES & FITTINGS

Always use new gasket or "O" ring when connecting lines or fittings. Coat "O" ring with refrigerant oil, and ensure it is not twisted during installation. To prevent damage to lines and fittings, always use 2 wrenches.

PLACING SYSTEM IN OPERATION

After component service or replacement has been completed, evacuate system thoroughly with a vacuum pump. Charge system with proper amount of refrigerant. See REFRIGERANT OIL & REFRIGERANT CAPACITY tables in the A/C COMPRESSOR SERVICING article. Perform leak test. After system has been leak tested, check system operation.

Note. A/C systems normally will not need additional refrigerant oil unless oil loss has occurred due to ruptured lines, leaking compressor seals, compressor overhaul or component replacement.

HARRISON HD6/HR6-HE 6-CYLINDER, HR100T & HR110-MD 4-CYLINDER

& V5 5-CYLINDER

1. Operate system for several minutes to stabilize system. Turn engine off. Discharge system using approved refrigerant recovery/recycling equipment. Remove compressor. Drain and measure oil.
2. If no oil leaks exist and more than one ounce is drained, add drained amount using new oil. If less than one ounce is drained, add 2 ounces of new oil.
3. If replacing A/C components, add specified amount of refrigerant oil to system. See HD6/HR6-HE, HR100T, HR110-MD & V5 COMPONENT REFRIGERANT OIL CAPACITIES table. Install drain plug and compressor. Evacuate and recharge system. Perform leak test.

HD6/HR6-HE, HR100T, HR110-MD & V5 COMPONENT REFRIGERANT OIL CAPACITIES

NIPPONDENSO 10PA20 10-CYLINDER

1. Slowly discharge system using approved refrigerant recovery/recycling equipment. Remove A/C compressor, and drain compressor oil. Measure amount drained, and discard oil.
2. If no leak exists, add drained amount plus one ounce. If excessive leak exists, remove accumulator and drain oil. Measure amount drained, and discard oil.
3. If amount drained is less than 3 ounces, add 3 ounces. If amount drained is more than 3 ounces, add drained amount. If system components are replaced, add specified amount. See 10PA20 COMPONENT REFRIGERANT OIL CAPACITIES table.

10PA20 COMPONENT REFRIGERANT OIL CAPACITIES

Scheme 5

1. Operate engine at high idle with A/C on for 15 minutes. Stop engine. Connect manifold gauge set to compressor service valves. Ensure valves on gauge set are closed. Place both valves on compressor in mid position. Start engine, and operate A/C.
2. Slowly turn compressor suction valve clockwise toward closed (front-seated) position. When suction pressure is reduced to zero, turn engine and compressor off, and quickly turn suction valve stem inward to full front-seated position. Turn discharge valve into front-seated position.
3. Loosen oil level plug to release internal pressure in compressor. Compressor is now isolated from rest of system, and service valves can be removed from compressor.
4. Remove compressor oil plug. Look through oil fill plug hole, and rotate compressor crankshaft to allow dipstick to be fully inserted. Insert Dipstick (6465), and measure oil. (Scheme 5) Each mark on dip-stick represents one increment.
5. Place angle gauge across flat areas on mounting ears. Determine amount of oil needed based on mounting angle. See «SD-709 & SD-7H15 COMPRESSOR OIL INCREMENT CAPACITIES»(/buick/century/v-1982-1996/remont/general-servicing-all-makes/#ac-compressor-refrigerant-oil-checking) table.
6. If necessary, correct compressor oil level. Install compressor oil plug, and tighten it to 72-108 INCH lbs. (8-12 N.m). Evacuate and recharge A/C system. Perform leak test.

SD-709 & SD-7H15 COMPRESSOR OIL INCREMENT CAPACITIES

ZEXEL ROTARY VANE

1. Slowly discharge system using approved refrigerant recovery/recycling equipment. Remove A/C compressor. Install compressor oil drain Adapters (SA9149AC-5 and SA9149AC-6) to service ports. Drain compressor oil. Measure amount drained, and discard oil.
2. Add proper amount of refrigerant oil to compressor (total system capacity minus amount retained in components that have not been replaced). See ZEXEL COMPONENT REFRIGERANT OIL CAPACITIES table. See REFRIGERANT OIL & REFRIGERANT CAPACITY tables in the «A/C COMPRESSOR SERVICING»(/buick/century/v-1982-1996/remont/general-servicing-all-makes/#ac-compressor-servicing) article for total system capacity. Install compressor. Evacuate and recharge A/C system. Perform leak test.

ZEXEL COMPONENT REFRIGERANT OIL CAPACITIES

See also:
• A/C COMPRESSOR SERVICING
• SD-709 & SD-7H15 COMPRESSOR OIL INCREMENT CAPACITIES