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cooling fan on after big 3 upgrade


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Posted

i'm stumped. after i upgraded the big 3 again, the cooling fan on the driver's side is always on.

 

i can rewire it to make it work like it's supposed to, but i'd like to know why it's doing this.

 

i didn't short anything. i ran the new wires to the same spots i ran the last ones. any suggestions?

Posted

hmmm. Try swapping the relay for that fan with the one for the other fan to rule out a bad relay (although I doubt that's it). Could be the coolant temp sensor in the lower intake is bad, but, from my experience, when they go bad, they will give a "cold" reading to the ECM.

Posted

forgot to mention i already did that.

 

and to clarify, the fan is on whether the ignition is or not. as soon as i hook the grounds back up, the fan comes on.

Posted

not that i can see. i can't even imagine what i could have disconnected that would have that effect

Posted

I can only think that something is being grounded, completing the circuit, for the fans to kick in.

 

You only touch the main ground and positive cables, correct?

Posted

Did you get the right ground above the radiator? Maybe you got another groung instead of the negative battery ground. I know on my car theres two grounding spots there....

Posted

only main positives and negatives, yes.

 

19cutlass94, i didn't even touch that ground. i left all the factory grounds in place, and ran my new grounds elsewhere

Posted

either the fan is getting power at the fan wires them selfs or the input for the relay is getting constant power... my guess is you have a short somewhere in the wiring.

Posted

Did you get the right ground above the radiator? Maybe you got another groung instead of the negative battery ground. I know on my car theres two grounding spots there....

 

The right ground? Another ground? Ground is ground. Now whether or not it's switched is another thing.

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