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take a look at the connector that feeds the resister that mounts next to the fan under the dash below the glove box the connectors over heat and become loose making the connection fail
The signal path is that coolant sensor tells ECU that the engine is 'hot'. Voltage at the relay for the fans switches on main voltage via a fuse to the fans. Check the fans first; run a wire from the live battery terminal to the fans' positive connection. If the fans do not operate check the negative wires from the fans for continuity and quality of connections. If fans do run then check the fuse and the fan relay. The fan relay might be interchangeable with one of the other relays (main lights?) so temporarily swap it over and see if that has any effect.
F you have battery power and ignition power at the relay, and the circuit is good from the relay to the fan. then the fan is turned on bt the high pressure A/C switch or the ECU. If the circuit (ground ) to the ECU is good you probably have a bad ECU.
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