Hummer 13587668 Air Conditioner Refrigerant Pressure Sensor Assembly

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The pressure cycling switch, located on top of the hard line connecting the condenser to the air conditioning thermostatic expansion valve (TXV), is crucial in the AC system. It detects low refrigerant line pressure and turns the system off and on to increase the pressure. If the pressure becomes too high, the pressure cut-off switch shuts the system off. To replace the pressure cycling switch, an automotive air conditioning technician should discharge the system first. Then, unplug the electrical connector and unscrew the old switch. Lubricate the O-ring with clean refrigerant oil before installing the new switch. Screw it in until hand tight and then securely tighten. Reconnect the electrical connector and have the technician who discharged it evacuate, recharge, and leak test the system.

The pressure sensor is located on the hard line from the condenser to the air conditioning thermostatic expansion valve(TXV). Remove the air filter housing. Unplug the electrical connector from the pressure cycling switch. Disconnect the electrical connector to the pressure switch. Unscrew the pressure sensor. Replace the 0-ring with a new one. Before installing it, lubricate it with clean refrigerant oil of the correct type. Screw the new sensor into place until hand tight, then tighten it securely. Reconnect the electrical connector. Install the air filter housing.

The HVAC pressure switch is located at the bottom-right corner of the condenser and mounted to the refrigerant lines. Remove it by lifting the front of the vehicle and supporting it on jackstands, followed by the removal of the splash guard between the bumper cover and the subframe.

To remove the air filter housing, start by unplugging the electrical connector from the sensor. Then, unscrew the sensor from the Schrader valve, making sure to use a back-up wrench on the fitting to prevent any damage to the refrigerant line. For installation, begin by lubricating the switch O-ring with clean refrigerant oil of the correct type. Next, screw the new switch onto the threads until hand tight and then tighten it securely. Finally, reconnect the electrical connector.

To remove the low-pressure switch, start by unplugging the electrical connector and then unscrewing the switch. For installation, screw the new switch onto the threads until hand tight and then tighten it securely before reconnecting the electrical connector. To remove the pressure sensor, unplug the electrical connector from the sensor near the air conditioning compressor and then remove the sensor from the air conditioning line fitting while holding the fitting using an open-end wrench to prevent deforming the pressure line. For installation, install the pressure sensor and then tighten it securely.

Start by unplugging the electrical connector and then unscrewing the switch using an open-end wrench.

Hold the fitting with an open-end wrench to avoid damaging the pressure line.

After raising the vehicle, the right front wheel and inner fender splash shield should be removed.

The final step is to reconnect the electrical connector.

From underneath the vehicle, the electrical connector should be unplugged from the pressure sensor.

Unplug the electrical connector from the sensor.

Unplug the electrical connector from the sensor near the air conditioning compressor and then remove the sensor from the air conditioning line fitting while holding the fitting using an open-end wrench to prevent deforming the pressure line.

Start by unplugging the electrical connector and then unscrewing the switch using an open-end wrench.

Lubricate the new O-rings with compatible refrigerant oil and screw the new sensor onto the threads, tightening it securely.

Start by unplugging the electrical connector and then unscrewing the switch using an open-end wrench.

Start by unplugging the electrical connector and then unscrewing the switch using an open-end wrench.

Before starting the removal process, the right front wheel lug nuts should be loosened, and the vehicle should be raised and securely supported on jackstands.

To replace the air conditioning pressure sensor, first unplug the electrical connector from the sensor. Then, unscrew the sensor from the Schrader valve, using a back-up wrench on the fitting for the sensor to prevent damaging the refrigerant line. Lubricate the switch O-ring with clean refrigerant oil of the correct type. Screw the new sensor onto the threads until hand tight, and then tighten it securely. Finally, reconnect the electrical connector.

Install the new pressure sensor and then tighten it securely before reconnecting the electrical connector.

The new sensor should be screwed in until hand tight and then securely tightened.