SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSBUICK1995REGAL CUSTOM, 4D SEDAN, 3.8 LREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 3.8LDIAGNOSTIC CHARTSCHART C-12B, COOLING FAN ON AT ALL TIMES (2 OF 4)
1995 Buick Regal Custom, 4D Sedan, 3.8 L

Chart C-12B, Cooling Fan On At All Times (2 Of 4)

1995 Buick Regal Custom, 4D Sedan, 3.8 LSECTION Chart C-12B, Cooling Fan On At All Times (2 Of 4)
NOTE: Test numbers refer to numbers on diagnostic charts.
  1. Checks if circuit No. 473 is shorted to ground. If test light comes on, wire is shorted to ground. Continuing with chart diagnosis will isolate short.
  2. Checks if circuit No. 335 is shorted to ground, which would keep relay closed at all times.
  3. If test light is off after disconnecting PCM, ensure circuit No. 335 is not shorted to battery voltage. If circuit is not shorted to battery voltage, PCM is shorted internally.
  4. If test light is off after disconnecting PCM, ensure circuit No. 473 is not shorted to battery voltage. If circuit is not shorted to battery voltage, PCM is shorted internally.
Fig 1: Chart C-12A, Cooling Fan Circuit Schematic (Regal)
G94H31267Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.