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So should I replace the ECT or just leave my setup the way it is.[/b]
My car was like yours, somedays it would work fine but others it would fail to make the fan spin at the right time until I decided to modify the fan's logic.
Now for Peace of Mind if you have like $20 bucks to spare it wouldn't hurt if you replace the ECT sensor, you can install it yourself just make sure you do it when the car is cold, if your Thermostat it's over 10 years old replace it too.
Considering your car's age I wouldn't trust the stock Fan logic anymore
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For now I hooked up a switch and a 40amp relay to my fan motor. Works great. But it draws alot of amps.[/b]
You know your hack sounds pretty solid, if your alternator is in great shape you shouldn't worry that much about the amp consumption IMO, so just keep an eye on the Temp gauge and hit the switch when required, or look for an aftermarket fan controller as someone pointed out before, but what you already did sounds good to me.