Buick Encore: Diagnostic information and procedures

Leak testing

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Fastener Tightening Specifications

ADHESIVES, FLUIDS, LUBRICANTS, AND SEALERS

Adhesives, Fluids, Lubricants, and Sealers

REFRIGERANT SYSTEM SPECIFICATIONS

Refrigerant System Capacities

DIAGNOSTIC INFORMATION AND PROCEDURES

LEAK TESTING

Special Tools

• BO-42220 Universal 12V Leak Detection Lamp
• GE-39400-A Halogen Leak Detector
• GE-41447 R-134A A/C Tracer Dye-Box of 24
• GE-43872 Fluorescent Dye Cleaner
• GE-46297 A/C Dye Injector Kit
• GE-46297-12 Replacement Dye Cartridges

For equivalent regional tools, refer to Special Tools.

Refrigerant Leak Testing

NOTE: These vehicles are not now manufactured with fluorescent dye installed directly into the air conditioning (A/C) system. Therefore, if refrigerant leak testing is required, add florescent dye into the air conditioning (A/C) system.

The fluorescent dye mixes and flows with the polyalkylene glycol (PAG) oil throughout the refrigerant system.

Verifying some passive leaks may require using the GE-39400-A detector , even though the A/C system contains fluorescent dye.

Fluorescent Leak Detector

Fluorescent dye will assist in locating any leaks in the A/C system.

NOTE: PAG oil is water soluble.

• Condensation on the evaporator core or the refrigerant lines may wash the PAG oil and fluorescent dye away from the actual leak. Condensation may also carry dye through the HVAC module drain.
• Leaks in the A/C system will be indicated in a light green or yellow color when using the leak detection lamp.

Use the leak detection lamp in the following areas:

• All fittings or connections that use seal washers or O-rings
• All of the A/C components
• The A/C compressor shaft seal
• The A/C hoses and pressure switches
• The HVAC module drain tube, if the evaporator core is suspected of leaking
• The service port sealing caps
• The sealing cap is the primary seal for the service ports.

• Follow the instructions supplied with the BO-42220 lamp.
• To prevent false diagnosis in the future, thoroughly clean the residual dye from any area where leaks were found. Use a rag and the approved GE-43872 cleaner.

Fluorescent Dye Injection

NOTE: Use only fluorescent dye approved by General Motors.

NOTE: Do NOT overcharge the A/C system with dye.

• GE-41447 dye can be poured directly into a removed A/C component.
• GE-46297-12 dye cartridge is injected into the low side port using GE-46297 injector kit.
• Not all of the fluorescent dyes are compatible with PAG oil. Some types of dye decrease the oil viscosity or may chemically react with the oil.
• R-134A leak detection dye requires time to work. Depending upon the leak rate, a leak may not become visible for between 15 minutes and 7 days.
• To prevent false diagnosis, thoroughly clean any residual dye from the service port with a rag and the approved fluorescent dye cleaner GE-43872 dye cleaner.

Halogen Leak Detector

WARNING: Do not operate the detector in a combustible atmosphere since its sensor operates at high temperatures or personal injury and/or damage to the equipment may result.

Ensure that the vehicle has at least 0.45 kg (1 lb) of refrigerant in the A/C refrigeration system in order to perform a leak test. Refer to Refrigerant Recovery and Recharging (R-134a) for recharging the A/C system.

NOTE:

Halogen leak detectors are sensitive to the following items:

• Windshield washing solutions
• Many solvents and cleaners
• Some adhesives used in the vehicle

Clean and dry all surfaces in order to prevent a false warning. Liquids will damage the detector.

NOTE: Follow a continuous path in order to ensure that you will not miss any possible leaks. Test all areas of the system for leaks.

Follow the instructions supplied with the GE-39400-A detector.

Air conditioning (a/c) system performance test

This test measures the operating efficiency of the A/C system under the following conditions:

• The current ambient air temperature
• The current relative humidity
• The high side pressure of the A/C system
• The low side pressure of the A/C system
• The temperature of the air being discharged into the passenger compartment

Test Description

The numbers below refer to the step numbers on the diagnostic table.

1

This step determines if the A/C system has at least the minimum refrigerant charge required to operate the system without damage.

2

This step measures the performance of the A/C system.

3

This step is to allow for vehicle variations as well as high ambient temperatures.

Air Conditioning (A/C) System Performance Test

A/C Performance Table

A/C DIAGNOSTICS CHART

HEATING PERFORMANCE DIAGNOSTIC

Heating Performance Diagnostic

DEFROSTING INSUFFICIENT

Defrosting Insufficient

NOISE DIAGNOSIS - BLOWER MOTOR

Noise Diagnosis - Blower Motor

AIR CONDITIONING COMPRESSOR OIL DIAGNOSIS

Air Conditioning Compressor Oil Diagnosis

NOISE DIAGNOSIS - AIR CONDITIONING (A/C) SYSTEM

Noise Diagnosis - Air Conditioning (A/C) System

NOISE DIAGNOSIS - HVAC MODULE

Noise Diagnosis - HVAC Module

ODOR DIAGNOSIS

Odor Diagnosis

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