Q: 1992 Ford Escort cooling fan not coming on

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I have a 1992 Ford Escort with a 1.9 engine. When the car reaches operating temperature the cooling fan will not come on. Fan operation has been verified with power manually applied to the fan. I am thinking the PCM is not sending the control signal to the fan when Engine reaches specified temperature. Currently I have removed one of the relays(3 which all work) so that the fan runs at low speed key on engine running to prevent overheating. Any tips as to how and when to test the control driver at the PCM?

My car has 1000000 miles.
My car has an automatic transmission.

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