It'll definitely overheat with no Fans - PERIOD - Check the Fuses at the Pos Battery Post - You can swap relays around from other systems to check Fan Relays out - be sure Fan Connectors & Rad Coolant Temp Sensor Lower-Rad Pass-side is plugged in.
The Temp Sensors at Thermostat Housing aren't involved with Fan functions but one of them talks to ECU - the other is Temp Gauge Sensor & BOTH MUST WORK - as well as oil pressure and tachometer Gauges!
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