1985 Mazda RX-7 SFACTORY OEM SERVICE PROCEDURE

Coolant THERMO Sensor Test

Coolant thermo sensor is located in water pump. Using an ohmmeter, check sensor resistance at various temperatures. See COOLANT THERMO SENSOR RESISTANCE specification table.

COOLANT THERMO SENSOR RESISTANCE

Temperature Ohms
-4Β°F (-20Β°C) 17,820-14,580
68Β°F (20Β°C) 2690-2210
176Β°F (80Β°C) 352-288
Factory Service Tools

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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.

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