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 THERMOVALVE
- Remove coolant thermovalve from throttle body. Place coolant thermovalve in container of water.
- Heat water gradually and note temperature at which air will pass through proper port location of valve. See COOLANT THERMOVALVE SPECIFICATIONS table. Temperature of air passage must be within specification.
COOLANT THERMOVALVE SPECIFICATIONS
| Application | Air Passage Through Valve Ports | ||||
|---|---|---|---|---|---|
| Non-Turbo | |||||
| A/T | |||||
| Greater Than 154°F (68°C) | Center To Bottom | ||||
| Less Than 154°F (68°C) | Center To Top | ||||
| M/T | |||||
| Greater Than 171°F (77°C) | (1) | ||||
| Less Than 171°F (77°C) | Top To Bottom | ||||
| Turbo | |||||
| Greater Than 140°F (60°C) | (1) | ||||
| Less Than 140°F (60°C) | Top To Bottom | ||||
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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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