C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Testing cooling fan motor question???

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Old Jun 12, 2013 | 05:36 PM
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Default Testing cooling fan motor question???

On an 86, is the main cooling fan 12v? Can i test it to see if it works with the key on and jump 12v from the battery to the fan? Thanks
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Old Jun 12, 2013 | 08:50 PM
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Originally Posted by Lucky86
On an 86, is the main cooling fan 12v? Can i test it to see if it works with the key on and jump 12v from the battery to the fan?
Don't need the key on for that test

1st .check fan works by putting 12V and Neg direct to fan
2nd .check for 12V in at fan relay (red wire )
3rd .check wiring by jumpering the terminals on the fan relay ( red to red / blk ) fan should run
4th .key on check for 12v on the blue wire


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Old Jun 12, 2013 | 11:53 PM
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Thank you, i will try that tomorrow
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Old Jun 13, 2013 | 12:26 AM
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Don't even need to do that.
jumper pins A&B on the ALDL like you were going to check codes, and the fan will run.
<-------------------------my 86
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Old Jun 13, 2013 | 01:41 AM
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can you please give me a little more info on how to try that. Do i use a paper clip?
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Old Jun 13, 2013 | 03:56 AM
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It doesn't matter what you use. Most people use a paper clip. You can use a wire or a pair of pointed tweezers. The ALDL connector is above your right leg underneath the dash. It looks like this:



It might have a cover on it that just pulls off toward the rear of the car. Some people just leave the cover off. Mine has a cover on it in this pic (far right side of the picture):

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