Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1987 Mazda RX-7 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Coolant THERMOSENSOR
- Remove coolant thermosensor from water pump. Place switch in water with a thermometer. Heat water gradually.
- Using an ohmmeter, check the resistance between both terminals as the temperature rises. Check resistance using COOLANT THERMOSENSOR chart. If any abnormalities are found, replace sensor.
COOLANT THERMOSENSOR CHART
| Temperature: °F (°C) | Resistance: Ohms |
|---|---|
| -4 (-20) | 16,040-16,362 |
| 68 (20) | 2425-2475 |
| 176 (80) | 314-324 |
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:
- • 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.
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