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The function of the air conditioner compressor is to compress the gaseous refrigerant into a liquid at a high pressure. The air conditioner compressor is driven by the engine. Since the compressor consumes the power of the engine when operating, the compressor is automatically turned off when the vehicle is warmed up or accelerated. . The air conditioning compressor assembly of the GM Buick sedan consists of a compressor, a clutch plate, a belt pulley component, a high pressure relief valve, a clutch control solenoid, and a system control switch.
In order to improve the quality of the engine during idle operation and improve the performance of the full throttle opening and air conditioning system operation, the clutch of the compressor is controlled by the ECM. In order to properly control the cooling fan, the clutch of the compressor, and the idle air control valve (IAC valve), a pressure sensor is installed in the control circuit, and the high pressure and low pressure side pressure are monitored by the sensor. If the ECM detects that the corresponding pressure circuit is faulty, the air conditioner compressor clutch will be the main part of the general Buick sedan automatic air conditioning system in the car position 1 - under the hood power distribution center 2 - rear luggage compartment release relay 3 - rear windshield Frost relay 4 - air blower motor control module 5 - fuse box automatically disengaged.
The air conditioner compressor clutch relay is controlled by the ECM. When the air conditioner compressor clutch is engaged, the engine idle speed is increased by the ECM control; when the engine throttle is suddenly opened, the engine is running at a high speed, the power steering is at a high load, and the engine heat engine is started. The ECM control automatically disengages the air conditioner compressor clutch. In addition, when the engine coolant temperature is too high, the air conditioner compressor clutch is automatically disengaged. Tests for these functions should be included when testing the air conditioner compressor clutch control circuit. When performing the diagnosis of the air conditioner compressor clutch control circuit, first check whether the relevant fuse and fusible connector have been blown. Replace the corresponding fuse as needed and repair the short circuit fault of the circuit. Ensure that all relevant GM Buick automatic air conditioning system maintenance 6-occupant seat heater control module 7 - body control module (BCM) 8 - power control module (PCM) 9 - accessory relay car electrical and harness connector connection is clean and Reliable, repair as needed.
The engine coolant temperature is higher than 125 ° C; the intake air temperature is lower than 5 ° C. The steps are as follows: (1) If the system does not perform the self-diagnosis program, the self-diagnosis program should be executed first, if the system has performed the self-diagnosis program, You can continue to check the next step.
(2) Install the scanning tool to check if the fault code has been stored. If the fault code is stored, first remove the displayed code fault; if no fault code is stored, proceed to the next step.
(3) Ensure that the atmospheric temperature is higher than 5 °C and the air conditioning system pressure is greater than 0.
25MPa, engine coolant temperature is lower than 121 °C. Disconnect the air conditioner switch, turn on the ignition switch, turn off the engine, and listen to the compressor clutch for the engagement sound. If the compressor clutch is engaged, continue to step (18); if the compressor clutch cannot engage, continue the next inspection.
(4) The engine is idling, the coldest mode is selected, and the compressor clutch is observed. If the compressor clutch is engaged, the fault is intermittent. If the compressor clutch is not engaged, the next step can be continued.
(5) Maintain the selected mode and monitor whether there is an air conditioning request display on the data list displayed on the scanning tool. If there is an air conditioning request display, continue with step (9). If there is no air conditioning request display, Continue to the next check.
(6) Disconnect the ignition switch and disconnect the ECM harness connector. Turn on the ignition switch, keep the selected mode, check the voltage on the air conditioning request circuit on the ECM harness connector with a multimeter. If the battery voltage is displayed, continue with step (8). If the battery voltage is not displayed, continue to check the next step. .
(7) Check if the air conditioning request circuit is open circuit, short circuit to ground or poor connection of air conditioner control module plug, repair as needed, continue to check in step (29) after repair; if no problem is found, proceed to the next step.
(8) Check if the air conditioning request circuit is poorly connected at the ECM harness connector, repair as needed, and continue to check in step (29) after repair; if no problem is found, continue with step (27).
(9) Observe the displayed value of the A/C refrigerant pressure on the screen of the scanning tool. If the pressure is within the range of 0.25 to 3.09 MPa, continue the inspection in step (12); if the pressure is not within the specified range, continue to the next step. an examination.
(10) Install the air conditioning test meter group and observe the high pressure side refrigerant pressure. If the pressure is within the range of 0.25 to 3.0 MPa, continue to the next step. If the pressure is not within the specified range, the refrigerant should be filled and continue (29). Step 2 Air Conditioning Compressor Assembly 1 - Clutch Plate 2 - Retaining Ring 3 - Pulley Parts Bearing 4 - Pulley Parts 5 - Clutch Solenoid 6 - Sealing Assembly 7 - Compressor Parts 8 - "0" Ring 9 - System control switch 10 - high pressure relief valve 11 - snap ring 12 - sealing gasket 13 - passage port 14 - drain port 15 - compressor back cover diagnosis, turn on the air conditioning switch on the air conditioning control panel, 12V power supply will be provided ECMA/C request signal input terminal, ECM will monitor the corresponding pressure of the air conditioning system and control the A/C compressor clutch. If the corresponding pressure of the A/C system and the operating condition of the engine are within the specified normal range, the ECM will command A/ The C clutch relay is engaged, and when the A/C clutch relay engager is engaged, the battery voltage is supplied to the compressor clutch solenoid.
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