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</head><body><p>Always fit a thermo-switch and a manual override switch. The thermo switch should be compatible with the opening temperature of the engine thermostat. The thermoswitch should switch off at a temperature about 5 degrees C over the opening temperature of the thermostat. It should switch on near 90-95 degrees C.</p><p>Remember, the higher the temperature the better the cooling because of an increase in Delta T.<br></p><p>Kees Oudesluijs<br></p></body></html>