1974 Volvo 164 Automatic TransFACTORY OEM SERVICE PROCEDURE

Engine Coolant Sensor

Locate sensor in cylinder head and disconnect sensor lead. Connect ohmmeter between temperature sensor and ground. Reading should be between 500-2500 ohms. As point of reference, ohmmeter reading should be about 2500 ohms with engine coolant at 68Β°F (20Β°C). As temperature increases, resistance reading will decrease.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.