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Re: 1996 buick regal gransport 3.8L
If I remember correctly, the cooling fan relays are located in the underhood fuse block on the passenger's side. They are switched on and off per ECM command. There is one engine coolant temp sensor which the ECM uses to determine when to turn the fans on. I believe the engine coolant temp sensor is near the water outlet/thermostat housing in the lower intake manifold on the 3800 Series II.
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