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The A/C refrigerant pressure sensor protects the A/C system from operating when an excessively high or low pressure condition exists. The powertrain control module (PCM) disables the compressor clutch under the following conditions:Another possibility is that, once the system is running, the high pressure goes up too high thereby preventing it from running once it's been turned off. As before, shutting the car off for a while would allow the high side pressure to drop back down below the max limit value.
• A/C pressure is more than 3034 kPa (440 psi). The clutch will be enabled after the pressure decreases to less than 2068 kPa (300 psi).
• A/C pressure is less than 241 kPa (35 psi). The clutch will be enabled after the pressure increases to more than 248 kPa (36 psi).