The cooling fans only turn on when the temperature sensor is unplugged?

Hi,

First, make sure there is power to fuses (three of them) in the under-hood cooling fan relay box.

Next, you indicated the replacement of the relays. For them to actuate and turn a fan motor on, the PCM needs to provide a ground path to complete the primary side of the relay.

I attached the wiring schematic below. See if the wires I indicated have continuity to ground when the fans should be on.

Also, take a look through this link for a better description of the relay operation:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Let me know.

Take care,

joe

See pics below.