Question about 2002 Chevrolet Impala
1. The system should have bee Evacuated after installing all the new parts to remove natural atmosphere air.
2.The system should have then been recharged to the containment quantity of Freon, usually about 3 lbs, having added 3 fl. ozs. of PAG oil to lubricate the Compressor vanes.
Then the system is run up, on Max A/c and full blowers with the vent controls set as desired, engine RPM about 1000, and the COMPRESSOR CLUTCH SHOULD BE ROTATING, If the system is correct, then the Lo pressure return pipe will be cold, cold. If
not you will have to look for other causes, Broken belt, faulty Fuses and Relays, Thermostat in the Evaporator, Holed Conderser. Joint seals that were separated during the rebuild, wich should have been replaced at the time.
Best of luck in your efforts.
Posted on May 10, 2010
Are you sure the system is turning on. You may have a relay that went out when your compressor was changed. Has it properly been charges. A lot of these systems need to be vaccumed before charging.
Posted on May 10, 2010
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Posted on Jan 02, 2017
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The cooling fan clutch actuator valve controls the fluid flow from the reservoir into the working chamber. Once viscous fluid is in the working chamber, shearing of the fluid results in fan rotation.
The cooling fan clutch actuator valve is activated with a pulse width modulated (PWM) output signal from the powertrain control module (PCM). By opening and closing the fluid port valve, the PCM can control the cooling fan clutch speed. The cooling fan clutch speed is measured by a Hall-effect sensor and is monitored by the PCM during closed loop operation.
The PCM optimizes fan speed based on engine coolant temperature (ECT), engine oil temperature (EOT), transmission fluid temperature (TFT), intake air temperature (IAT), or air conditioning requirements. When an increased demand for fan speed is requested for vehicle cooling, the PCM monitors the fan speed through the Hall-effect sensor. If a fan speed increase is required, the PCM outputs the PWM signal to the fluid port, providing the required fan speed increase.
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