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Temp sensor in waterpump is for the computer. Let the car get up to temp that commands fans and see if terminal 85 on the relay is grounded. This would be the pcm commanding a ground to switch the relay. Terminal 86 and 30 should have constant power, gm has them jumped like that underneath. Does the car have a working a/c system? If so, turn the a/c on and see if both fans come on after a little bit of idling.
Report back.
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