Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2000 Pontiac Firefly (CANADA) L3-1.0LFACTORY OEM SERVICE PROCEDURE
A/C Compressor Control Module Description
The Air Conditioning (A/C) compressor control module controls the operation of the compressor clutch in response to the signals received from the following components:
^ The A/C ON/OFF switch
^ The A/C refrigerant pressure switch
^ The refrigerant (evaporator) temperature sensor
^ The Powertrain Control Module (PCM) With the A/C system in operation the A/C compressor control module performs the following functions:
^ Energizes the compressor clutch in response to the following conditions:
- An A/C system ON request
- The determination of favorable system conditions for A/C operation
^ De-energizes the compressor clutch in response to the following conditions:
- A high refrigerant pressure signal from the A/C refrigerant pressure switch
- A low refrigerant pressure signal from the A/C refrigerant pressure switch
- A low evaporator temperature signal from the refrigerant (evaporator) temperature sensor
- A high engine demand signal from the PCM
- An A/C system OFF request
^ The A/C ON/OFF switch
^ The A/C refrigerant pressure switch
^ The refrigerant (evaporator) temperature sensor
^ The Powertrain Control Module (PCM) With the A/C system in operation the A/C compressor control module performs the following functions:
^ Energizes the compressor clutch in response to the following conditions:
- An A/C system ON request
- The determination of favorable system conditions for A/C operation
^ De-energizes the compressor clutch in response to the following conditions:
- A high refrigerant pressure signal from the A/C refrigerant pressure switch
- A low refrigerant pressure signal from the A/C refrigerant pressure switch
- A low evaporator temperature signal from the refrigerant (evaporator) temperature sensor
- A high engine demand signal from the PCM
- An A/C system OFF request
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.