Question about 1987 Chevrolet Corvette

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I have a 1987 Corvett we just replaced the electric fan motor and we still have a problem. We were told that there are 3 sensors and we need to know the location of the sensor for the fan motor.

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  • Chevrolet Master
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GM has problem on cooling fan during the late 80.

The solution is not swapping sensor. It's using an universal fan relay system like the one picture below.

I have a 1987 Corvett - 46f56bc.jpg
Place the silver problem next to the radiator and set the correct temperature (195-215F) your want the fan to come on.

Just think of it as an insurance when the electrical system fail.

====
To answer your question.
The 3 sensors are at
1)single wire TAB sensor (near the thermostat cap)
2)single wire sensor with clip (on the block)
3)AC fan switch that not related to cooling system unless A/C is switched on.


Posted on Jul 30, 2010

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Disconnect the electrical at the top. Sometimes you can get the fan out and then the shroud-due to limited space. They would both come out from the top.
We mechanics will tell you to test the fan motor with jumper wires from the battery before you decide to pull it off. On most cars, the computer turns the fan on through a cooling fan relay. On your '87, it is possible that a thermal switch on the radiator may turn the fan relay on at a set temperature. One would have to see a wiring diagram.

Just looked at a diagram: If your car is fuel injected, check fuse #13, a 15 amp blue fuse. And same if carbureted, fuse #13-this fuse is for the relay and the fan motor. If carbureted, also check fuse #20-a 20amp fuse.
There are no computer controls for the fan on an '87. there is a thermo switch-at a set temperature, the switch will close-completing the ground path for the fan motor. There is also a radiator fan timer switch, tied in with the thermo switch and the air temperature sensor.
Sound complicated? Well, it is, even with no computer controls. If the fan motor is good, check or replace the thermo switch. Be sure and check those fuses, also. If no help, a tech will probably have to diagnose it.

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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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Replace the fan relay in the fuse box in the engine bay first. Fan motors very,very rarely go bad. Check the relay first, you may save yourself an a lot of time and money. It may also be a bad coolant temperature sensor or a bad connection and/or bad ground.

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hi craig cooling fans on those cars have two or three connection wires. two wires means one speed. three wires means two speeds. they work with extra poles in the motor, not with a resistance. when you have a motor with 3 conn. wires and only one speeed, you have to replace the motor. most types haves only one speed. extra speed fan motors where optional for extra heavy duty or high temps. if you have more questions let me know. greetings.

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Does the car shut off when it over heats? Did you flush the block out? If the car shuts off when it over heats then its either your after market electric fan is not kicking on or it's not pulling enough air through the radiator to cool it. Also check to make sure you have enough antifreeze in it. One other thing would be if the car does not die out its your temp sensor on the motor is not reading temperature right. Just recheck fluid levels start the car and watch to see if the electric fan kicks on it's something simple. A/C really does not affect temperature that much.

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