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There is a temperature switch on the passenger side bottom of the radiator that has a wire connector attached to it. The switch screws into the radiator and then the wires connect to that. That switch is what tells the relays to turn the cooling fan on. If your fans don't turn and the engine is running hot you can test the switch using the following steps. 1. turn the ignition to the on position but don't start the engine. 2. disconnect the wire connector to the switch on the bottom of the radiator. 3. using a small jumper wire, jump the two wires inside the connector. If the fans turn on then you will need to replace the temp switch. If the fans still don't turn on then you will need to check the fuses, relays, and the fans themselves.
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When 1990 Honda is running cooling fan does not come on but comes on when engine is off and I thermostat and temperature switch changed?"
