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.
1990 Mazda RX-7 Base, StandardFACTORY OEM SERVICE PROCEDURE
Coolant THERMOSENSOR Test: Notes
- Remove thermosensor. Place thermosensor in container of heated coolant with thermometer.
- Connect ohmmeter to thermosensor terminals. Note resistance at specified temperatures. See COOLANT THERMOSENSOR RESISTANCE table. Replace if not within specification.
COOLANT THERMOSENSOR RESISTANCE
| Coolant Temperature | Ohms |
|---|---|
| -4°F (-20°C) | 14,600-17,800 |
| 68°F (20°C) | 2300-2700 |
| 176°F (80°C) | 200-400 |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.