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1992–2002 Mazda RX-7 Radiator & Cooling FAQ's

Please read our FAQs page to find out more.

What cooling mods are essential on an FD?

A high‑efficiency radiator, upgraded heat exchanger/IC ducting, a fresh AST, and sealed shrouds/under‑trays help manage rotary heat and prevent hot spots.

How do I bleed the FD cooling system correctly?

Elevate the nose, use the AST bleeder, and run the heater to purge air. Recheck levels after heat cycles—air pockets can spike temps and stress coolant seals.

Is an oil cooler upgrade necessary?

The rotary relies heavily on oil cooling. Thermostatic oil coolers and clean ducting protect bearings and keep temps stable on track or in hot climates.