Overview
| WARNING | Take the following precautions when repairing an air conditioning system containing R-134a: Always wear safety goggles. Avoid contact with liquid refrigerant R-134a. R-134a vaporizes at approximately -25 C (-13 F) under atmospheric pressure and will freeze skin tissue. Never allow refrigerant R-134a gas to escape in quantity in an occupied space. It will displace the oxygen needed to support life. Never use a torch in an atmosphere containing R-134a gas. R-134a is non-toxic at all normal conditions, but it decomposes when exposed to high temperatures such as a torch flame. During decomposition it releases irritating and toxic gasses (as described in the Material Safety Data Sheet (MSDS) sheet from the manufacturer). Decomposition products are hydrofluoric acid, carbon dioxide and water. Failure to follow these instructions may result in serious personal injury. |
Note. To avoid damaging the vehicle or A/C components, the following precautions must be observed. The A/C refrigerant of all vehicles must be identified and analyzed prior to refrigerant charging. Failure to do so can contaminate the shop bulk refrigerant and other vehicles. Do not add R-12 refrigerant to an A/C system that requires the use of R-134a refrigerant. These 2 types of refrigerant must never be mixed. Doing so can damage the A/C system. Charge the A/C system with R-134a refrigerant gas while the engine is running only at the low-pressure side to prevent refrigerant slugging from damaging the A/C compressor. Use only R-134a refrigerant. Due to environmental concerns, when the A/C system is drained, the refrigerant must be collected using refrigerant recovery/recycling equipment. Federal, State/Provincial and/or local laws REQUIRE that R-134a be recovered into appropriate recovery equipment and the process be conducted by qualified technicians who have been certified by an approved organization, such as Automotive Service Excellence (ASE) or Mobile Air Conditioning Society (MACS). Use of a recovery machine dedicated to R-134a is necessary to reduce the possibility of oil and refrigerant incompatibility concerns. the instructions provided by the equipment manufacturer when removing refrigerant from or charging the A/C system. Refrigerant R-134a must not be mixed with air for leak testing or used with air for any other purpose above atmospheric pressure. R-134a is combustible when mixed with high concentrations of air and higher pressures. A number of manufacturers are producing refrigerant products that are described as direct substitutes for refrigerant R-134a. The use of any unauthorized substitute refrigerant can severely damage the A/C components. If repair is required, use only new or recycled refrigerant R-134a.
Note. To avoid contamination of the A/C system, the following precautions must be observed. Never open or loosen a connection before recovering the refrigerant. When loosening a connection, if any residual pressure is evident, allow it to leak out before opening the fitting. Evacuate a system that has been opened to install a new component or one that has discharged through leakage before charging. Seal open fittings with a cap or plug immediately after disconnecting a component from the system. Clean the outside of the fittings thoroughly before disconnecting a component from the system. Do not remove the sealing caps from a new component until ready to install. Refrigerant oil will absorb moisture from the atmosphere if left uncapped. Do not open an oil container until ready to use and install the cap immediately after using. Store the oil in a clean, moisture-free container. Install a new O-ring seal before connecting an open fitting. Coat the fitting and O-ring seal with PAG oil before connecting. When installing a refrigerant line, avoid sharp bends. Position the line away from the exhaust or any sharp edges that can chafe the line. Tighten threaded fittings only to specifications. The steel and aluminum fittings used in the refrigerant system will not tolerate overtightening. When disconnecting a fitting, use a wrench on both halves of the fitting to prevent twisting of the refrigerant lines or tubes. Do not open a refrigerant system or uncap a new component unless it is as close as possible to room temperature. This will prevent condensation from forming inside a component that is cooler than the surrounding air.
The Electronic Manual Temperature Control (EMTC) system heats or cools the vehicle depending on the Heating, Ventilation, and A/C HVAC control panel selection.
- The control panel selection determines heating or cooling, air distribution and enables blower motor operation.
- The temperature control setting determines the outlet air temperature.
- The blower motor switch varies the blower motor speed.
- During A/C operation, the system reduces the relative humidity of the air inside the vehicle.
Scheme 1
| WARNING | Take the following precautions when repairing an air conditioning system containing R-134a: Always wear safety goggles. Avoid contact with liquid refrigerant R-134a. R-134a vaporizes at approximately -25 C (-13 F) under atmospheric pressure and will freeze skin tissue. Never allow refrigerant R-134a gas to escape in quantity in an occupied space. It will displace the oxygen needed to support life. Never use a torch in an atmosphere containing R-134a gas. R-134a is non-toxic at all normal conditions, but it decomposes when exposed to high temperatures such as a torch flame. During decomposition it releases irritating and toxic gasses (as described in the Material Safety Data Sheet (MSDS) sheet from the manufacturer). Decomposition products are hydrofluoric acid, carbon dioxide and water. Failure to follow these instructions may result in serious personal injury. |
Note. To avoid damaging the vehicle or A/C components, the following precautions must be observed. The A/C refrigerant of all vehicles must be identified and analyzed prior to refrigerant charging. Failure to do so can contaminate the shop bulk refrigerant and other vehicles. Do not add R-12 refrigerant to an A/C system that requires the use of R-134a refrigerant. These 2 types of refrigerant must never be mixed. Doing so can damage the A/C system. Charge the A/C system with R-134a refrigerant gas while the engine is running only at the low-pressure side to prevent refrigerant slugging from damaging the A/C compressor. Use only R-134a refrigerant. Due to environmental concerns, when the A/C system is drained, the refrigerant must be collected using refrigerant recovery/recycling equipment. Federal, State/Provincial and/or local laws REQUIRE that R-134a be recovered into appropriate recovery equipment and the process be conducted by qualified technicians who have been certified by an approved organization, such as Automotive Service Excellence (ASE) or Mobile Air Conditioning Society (MACS). Use of a recovery machine dedicated to R-134a is necessary to reduce the possibility of oil and refrigerant incompatibility concerns. the instructions provided by the equipment manufacturer when removing refrigerant from or charging the A/C system. Refrigerant R-134a must not be mixed with air for leak testing or used with air for any other purpose above atmospheric pressure. R-134a is combustible when mixed with high concentrations of air and higher pressures. A number of manufacturers are producing refrigerant products that are described as direct substitutes for refrigerant R-134a. The use of any unauthorized substitute refrigerant can severely damage the A/C components. If repair is required, use only new or recycled refrigerant R-134a.
Note. To avoid contamination of the A/C system, the following precautions must be observed. Never open or loosen a connection before recovering the refrigerant. When loosening a connection, if any residual pressure is evident, allow it to leak out before opening the fitting. Evacuate a system that has been opened to install a new component or one that has discharged through leakage before charging. Seal open fittings with a cap or plug immediately after disconnecting a component from the system. Clean the outside of the fittings thoroughly before disconnecting a component from the system. Do not remove the sealing caps from a new component until ready to install. Refrigerant oil will absorb moisture from the atmosphere if left uncapped. Do not open an oil container until ready to use and install the cap immediately after using. Store the oil in a clean, moisture-free container. Install a new O-ring seal before connecting an open fitting. Coat the fitting and O-ring seal with PAG oil before connecting. When installing a refrigerant line, avoid sharp bends. Position the line away from the exhaust or any sharp edges that can chafe the line. Tighten threaded fittings only to specifications. The steel and aluminum fittings used in the refrigerant system will not tolerate overtightening. When disconnecting a fitting, use a wrench on both halves of the fitting to prevent twisting of the refrigerant lines or tubes. Do not open a refrigerant system or uncap a new component unless it is as close as possible to room temperature. This will prevent condensation from forming inside a component that is cooler than the surrounding air.
The Dual Automatic Temperature Control (DATC) system maintains the selected vehicle interior temperature by heating and/or cooling the air depending on the HVAC control panel selection.
- During A/C operation, the system reduces the relative humidity of the air inside the vehicle.
- The driver may override the automatic mode of operation.
- The temperature control setting is the desired cabin air temperature.
- The blower motor control override buttons vary the blower motor speed.
- The driver side and passenger side temperature settings can be individually controlled.
Scheme 2
Normal Operation and Fault Conditions
Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0532:00 | A/C Refrigerant Pressure Sensor A Circuit Low: No Sub Type Information | The A/C pressure transducer inputs a feedback voltage to the PCM. This DTC sets if the feedback voltage is lower than expected. |
| P0533:00 | A/C Refrigerant Pressure Sensor A Circuit High: No Sub Type Information | The A/C pressure transducer inputs a feedback voltage to the PCM. This DTC sets if the feedback voltage is greater than expected. |
DTC FAULT TRIGGER CONDITIONS
Voltage is provided to the AC clutch relay coil. When AC is requested and AC line pressures allow, a ground is provided to the AC clutch relay coil from the PCM, energizing the AC clutch relay.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0645:00 | A/C Clutch Relay Control Circuit: No Sub Type Information | The DTC sets when the PCM grounds the relay circuit and more voltage than expected is detected on the relay circuit. The DTC also sets when the relay circuit is off and no voltage is detected on the relay circuit. The PCM expects to detect voltage coming through the relay coil to the relay circuit when it is not grounding it. |
DTC FAULT TRIGGER CONDITIONS
This pinpoint test tests the functions of the HVAC system and identifies the correct HVAC symptom pinpoint test.
REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
During an actuator calibration cycle, the HVAC control module drives the defrost/register/footwell blend door until the door reaches both internal stops in the HVAC case. If the defrost/register/footwell blend door is temporarily obstructed or binding during a calibration cycle, the HVAC control module can interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be from the expected outlets.
When the engine is at operating temperature hot coolant flows from the engine through the heater core and back to the engine. Correct coolant temperatures are critical for good heater performance.
Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P1464:00 | A/C Demand Out Of Self Test Range: No Sub Type Information | This DTC sets when the PCM senses an A/C request during a PCM self-test. |
DTC FAULT TRIGGER CONDITIONS
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B101E:23 | Air Conditioning Mode Switch General Signal Failures Signal: Stuck Low | This on demand DTC sets when the BCM senses a path to ground on the A/C control circuit for when a self test is being performed. |
BODY CONTROL MODULE (BCM) DTC FAULT TRIGGER CONDITIONS
Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
During an actuator calibration cycle, the HVAC control module drives the temperature blend door until the door reaches both internal stops in the HVAC case. If the temperature blend door is temporarily obstructed or binding during a calibration cycle, the HVAC control module can interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be the expected temperature.
Voltage is supplied to the relay coil from the BJB fuse 23 (5A) and relay switch contacts from the BJB fuse 10 (40A).
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10AF:13 | Blower Fan Relay General Electrical Failures Circuit: Open | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the BCM senses no voltage on the relay coil ground circuit when the module is grounding the circuit. |
| B10AF:19 | Blower Fan Relay General Electrical Failures Circuit: Current Above Threshold | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the BCM senses excessive voltage on the relay coil ground circuit when the module is grounding the circuit. |
DTC FAULT TRIGGER CONDITIONS
Voltage is supplied to the relay coil from the BCM fuse 23 (5A) and relay switch contacts from the BCM fuse 10 (40A). When the blower motor relay coil receives a ground from the BCM, the relay coil is energized and voltage is delivered to the blower motor. The HVAC control module controls the ground for the blower motor.
REFER to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10AF:11 | Blower Fan Relay General Electrical Failures Circuit: Short to Ground | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the BCM senses a path to ground on the blower motor control circuit. |
DTC FAULT TRIGGER CONDITIONS
Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1B71:21 | Evaporator Temperature Sensor General Signal Failures Signal Amplitude < Minimum | This Continuous Memory Diagnostic Trouble Code (CMDTC) and on-demand DTC sets when the BCM senses lower than expected voltage from the evaporator temperature sensor. |
| B1B71:22 | Evaporator Temperature Sensor General Signal Failures Signal Amplitude > Maximum | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the BCM senses greater than expected voltage from the evaporator temperature sensor. |
| B1B71:2F | Evaporator Temperature Sensor General Signal Failures Signal Erratic | This on-demand DTC sets when the BCM senses erratic voltages from the evaporator temperature sensor. |
DTC FAULT TRIGGER CONDITIONS
Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P193E | A/C Clutch Request Signal | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the PCM does not receive the A/C request message from the BCM. |
DTC FAULT TRIGGER CONDITIONS
Refer to: Climate Control System - Vehicles With: Electronic Manual Temperature Control (EMTC) - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0532:00 | A/C Refrigerant Pressure Sensor A Circuit Low: No Sub Type Information | The A/C pressure transducer inputs a feedback voltage to the PCM. This DTC sets if the feedback voltage is lower than expected. |
| P0533:00 | A/C Refrigerant Pressure Sensor A Circuit High: No Sub Type Information | The A/C pressure transducer inputs a feedback voltage to the PCM. This DTC sets if the feedback voltage is greater than expected. |
DTC FAULT TRIGGER CONDITIONS
Voltage is provided to the AC clutch relay coil. When AC is requested and AC line pressures allow, a ground is provided to the AC clutch relay coil from the PCM, energizing the AC clutch relay.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P0645:00 | A/C Clutch Relay Control Circuit: No Sub Type Information | The DTC sets when the PCM grounds the relay circuit and more voltage than expected is detected on the relay circuit. The DTC also sets when the relay circuit is off and no voltage is detected on the relay circuit. The PCM expects to detect voltage coming through the relay coil to the relay circuit when it is not grounding it. |
DTC FAULT TRIGGER CONDITIONS
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U0140:00 | Lost Communication With Body Control Module: No Sub-Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets in the HVAC control module if data messages received from the BCM over the CAN are missing for 5 seconds or more. |
DTC FAULT TRIGGER CONDITIONS
The function test tests the functions of the HVAC system and identifies the correct HVAC symptom pinpoint test.
REFER to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
During an actuator calibration cycle, the HVAC control module drives the air inlet blend door until the door reaches both internal stops in the HVAC case. If the air inlet blend door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the air intake may not be from the expected source.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1083:00 | Recirculation Damper Motor: No Sub Type Information | This DTC sets when the HVAC control module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
DTC FAULT TRIGGER CONDITIONS
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
During an actuator calibration cycle, the HVAC control module drives the defrost blend door or the register/footwell blend door until the door reaches the internal stops in the HVAC case. If either blend door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be from the expected outlets.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1085:00 | Defroster Damper Motor: No Sub Type Information | This DTC sets when the HVAC control module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
| B1086:00 | Air Distribution Damper Motor: No Sub Type Information | This DTC sets when the HVAC control module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
DTC FAULT TRIGGER CONDITIONS
When the engine is at operating temperature hot coolant flows from the engine through the heater core and back to the engine. Correct coolant temperatures are critical for good heater performance.
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P1464:00 | A/C Demand Out Of Self Test Range: No Sub Type Information | This DTC sets when the PCM senses an A/C request during a PCM self-test. |
DTC FAULT TRIGGER CONDITIONS
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
During an actuator calibration cycle, the HVAC control module drives the temperature blend door until the door reaches both internal stops in the HVAC case. If the temperature blend door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be the expected temperature.
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
During an actuator calibration cycle, the HVAC control module drives the temperature blend door until the door reaches both internal stops in the HVAC case. If the temperature blend door is temporarily obstructed or binding during a calibration cycle, the HVAC control module may interpret this as the actual end of travel for the door. When this condition occurs and the HVAC control module commands the actuator to its end of travel, the airflow may not be the expected temperature.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1082:00 | Right Temperature Damper Motor: No Sub Type Information | This DTC sets when the HVAC control module senses a short to voltage, a short to ground, or an open when motor movement is commanded. |
DTC FAULT TRIGGER CONDITIONS
Voltage is supplied to the relay coil from BJB fuse 23 (5A) and relay switch contacts from BJB fuse 10 (40A). When the blower motor relay coil receives a ground from the BCM, the relay coil is energized and voltage is delivered to the blower motor control module. Power and ground for the blower motor is provided by the blower motor speed control. The HVAC control module sends a PWM signal to the blower motor speed control to control the blower speed.
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B10AF:13 | Blower Fan Relay General Electrical Failures Circuit: Open | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the BCM senses no voltage on the relay coil ground circuit when the module is grounding the circuit. |
| B10AF:19 | Blower Fan Relay General Electrical Failures Circuit: Current Above Threshold | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the BCM senses excessive voltage on the relay coil ground circuit when the module is grounding the circuit. |
| B10B9:00 | Blower Control: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) and on-demand DTC sets when the HVAC control module senses no voltage on the blower motor control PWM circuit. |
DTC FAULT TRIGGER CONDITIONS
Voltage is supplied to the relay coil from BJB fuse 23 (5A) and relay switch contacts from BJB fuse 10 (40A). When the blower motor relay coil receives a ground from the BCM, the relay coil is energized and voltage is delivered to the blower motor control module. Power and ground for the blower motor is provided by the blower motor speed control. The HVAC control module sends a PWM signal to the blower motor speed control to control the blower speed.
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1A63:00 | Right Solar Sensor: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses lower than expected voltage on an open, short to voltage or short to ground from the light sensor input circuit. |
| B1A64:00 | Left Solar Sensor: No Sub Type Information | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the HVAC control module senses an open, short to voltage or short to ground from the light sensor input circuit. |
DTC FAULT TRIGGER CONDITIONS
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| B1B71:21 | Evaporator Temperature Sensor General Signal Failures Signal Amplitude < Minimum | This Continuous Memory Diagnostic Trouble Code (CMDTC) and on-demand DTC sets when the BCM senses lower than expected voltage from the evaporator temperature sensor. |
| B1B71:22 | Evaporator Temperature Sensor General Signal Failures Signal Amplitude > Maximum | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the BCM senses greater than expected voltage from the evaporator temperature sensor. |
| B1B71:2F | Evaporator Temperature Sensor General Signal Failures Signal Erratic | This on-demand DTC sets when the BCM senses erratic voltages from the evaporator temperature sensor. |
DTC FAULT TRIGGER CONDITIONS
Refer to: Climate Control System - Vehicles With: Dual Automatic Temperature Control - System Operation and Component Description .
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P193E | A/C Clutch Request Signal | This Continuous Memory Diagnostic Trouble Code (CMDTC) sets when the PCM does not receive the A/C request message from the BCM. |
DTC FAULT TRIGGER CONDITIONS
Refrigerant Identification Testing
- Follow the instructions included with Refrigerant Blend Identifier to obtain the sample for testing.
- The refrigerant identifier will display one of the following: If the purity level of R-134a is 98% or greater by weight, the green PASS LED will light. The weight concentrations of R-134a, R-12, R-22, hydrocarbons and air will be displayed on the digital display. If refrigerant R-134a does not meet the 98% purity level, the red FAIL LED will light and an alarm will sound alerting the user of potential hazards. The weight concentrations of R-134a, R-12, R-22 and hydrocarbons will be displayed on the digital display. If hydrocarbon concentrations are 2% or greater by weight, the red FAIL LED will light, "Hydrocarbon High" will be displayed on the digital display, and an alarm will sound alerting the user of potential hazards. The weight concentrations of R-134a, R-12, R-22 and hydrocarbons will also be displayed on the digital display.
- The percentage of air contained in the sample will be displayed if the R-134a content is 98% or greater. The refrigerant identifier eliminates the effect of air when determining the refrigerant sample content because air is not considered a contaminant, although air can affect A/C system performance. When the refrigerant identifier has determined that a refrigerant source is pure (R-134a is 98% or greater by weight) and air concentration levels are 2% or greater by weight, it will prompt the user if an air purge is desired.
- If contaminated refrigerant is detected, repeat the refrigerant identification test to verify that the refrigerant is indeed contaminated.
- Recover the contaminated refrigerant using suitable recovery-only equipment designed for capturing and storing contaminated refrigerant only. Recover the contaminated refrigerant using suitable recovery-only equipment designed for capturing and storing contaminated refrigerant only.
- Determine and correct the cause of the customer's initial concern.
- Flush the A/C system.
- Dispose of the contaminated refrigerant in accordance with all federal, state and local regulations.