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Radiator Fan Operates Continuously With Key On

  1. Ensure engine coolant temperature is less than 194°F (90°C). Remove fan No. 1 relay from fuse and relay box. Turn ignition on. If fan motor does not run, go to next step. If fan motor runs, check for short to voltage in Black/Red wire between fuse and relay box, radiator fan motor and A/C fan No. 2 relay. If Black/Red wire is okay, replace fuse and relay box.
  2. Check fan No. 1 relay connector terminal No. 1, with a test light connected to battery voltage. If test light does not glow, go to next step. If test light glows, replace fan No. 1 relay and check system operation. If fan motor continues to run, replace fuse and relay box.
    NOTE: Models not equipped with A/C have a shorting clip in place of A/C dual pressure switch.
  3. Backprobe A/C dual pressure switch connector terminal No. 2 (Light Green wire) with a test light connected to battery voltage. If test light glows, go to next step. If test light does not glow, check for open in Light Green wire between A/C dual pressure switch connector and fan thermoswitch. If Light Green wire is okay, replace the fan thermoswitch.
  4. Check for open in Light Green/Black wire between fuse and relay box and A/C dual pressure switch connector. If Light Green/Black wire is okay, replace A/C dual pressure switch (A/C equipped models) or shorting clip (non-A/C models).
    Fig 1: Identifying Fuse/Relay Box Connectors and Terminals (Top View)
    G96A18564Courtesy of GENERAL MOTORS CORP.
    Fig 2: Identifying Fuse/Relay Box Connectors and Terminals (Bottom View)
    G96B18565Courtesy of GENERAL MOTORS CORP.
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