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Home >> Chevrolet >> 1994 >> Cavalier VL, 2D Coupe, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 2.2L >> Diagnostic Charts >> Chart C-12, Cooling Fan Circuit Diagnosis >> Notes

Chart C-12, Cooling Fan Circuit Diagnosis: Notes

Cooling fan is controlled by Powertrain Control Module (PCM) based on inputs from Engine Coolant Temperature (ECT) sensor, Intake Air Temperature (IAT) sensor, A/C control switch, A/C refrigerant pressure sensor and Vehicle Speed Sensor (VSS). PCM grounds circuit No. 335, energizing cooling fan relay and turning on cooling fan. Cooling fan is turned on when engine coolant temperature is greater than 223°F (106°C), A/C clutch is requested, vehicle speed is less than 35 MPH, or Diagnostic Trouble Code (DTC) 14 or 15 is set. PCM will turn fan off when engine coolant temperature is less than 248°F (120°C) or if A/C refrigerant pressure is high.

NOTE: Test numbers refer to numbers on diagnostic charts.
  1. With field service mode activated, coolant fan control driver should close, energizing fan relay control.
  2. Tests if fault is in wiring to fan or fan relay connection.
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