Question about Chevrolet Sprint

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I have a 1987 chevy sprint car 3 cyl,auto. and the cooling fans fail to come on and off so this makes the car run hot. If i run a hot wire the fanit will run all the time till disconnected. where is the relay or senser that regulate when they turn on and off???

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Ask a parts store for a cooling fan sensor,it is usually near the thermostat housing and easy to replace.

Posted on Jul 26, 2009

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Hi. I would check that fan circuit to be sure of its integrity. Use the procedure below to troubleshoot:



1.Check for broken wires or loose connectors around the fan circuit. Inspect connectors at the fan motor, relay, sensor or heat sensitive switch, and the Electronic Control Module (ECM)--your car’s computer control system. Also, make sure to check for a possible blown fan fuse. These are common and overlooked troublesome spots that may cause a fan to fail.


2.Run and bring the engine to warm temperature. With the engine running, use a voltage test light to check for power to the motor fan. Be extra careful and make sure to keep your hands and tools away from the belt, fan or any other engine moving parts. If voltage is reaching the fan motor, the test light should glow.


3.Turn off the engine after you see the light glow. Apply direct voltage to the fan motor from your car battery using a pair of spare wires. If the fan fails to operate, replace the fan motor. If the motor operates, your problem is in the motor connector.


  • NOTE_ If you suspect a defective ECM take your vehicle to a service shop for a computer analysis. In most cases, the ECM is rare to be the cause of a failing fan. The above steps should take you to the root cause of your problem and help you fix the cooler fan.

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