Wondering if you have simply overfilled the system.
Look for the obvious leaks first and fix that if any, such as hoses and clamps.
If it's overheating though it could be sending coolant to the overflow and dumping it.
If none of the above you might need to take a look at the thermostat.
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MY00 WRX. 89 Prelude. 99 CRV
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