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Old 11-27-2010, 12:28 PM
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electric fan problems

I have installed a electric fan on my 327 with a new aluminum radiator, the fan has a temp probe installed in radiator to find temp, but I found when the fan comes on it is blowing air out from the engine bay instead of pulling air from the outside. Do I need to reverse some wires or something? I drove the car and it cools okay but common sense will tell you when operating the chevelle if fan is pushing and the car pulling the air in from the outside seems both would cancel each other out. It didn't say anything in the directions, do you guys have some insite with this problem? Thanks

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Old 11-27-2010, 12:47 PM
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If there are (2) wires going into the motor they can be swapped and the fan will run the other direction.
Some fans have only (1) wire. The housing is ground and wire is +. These cannot be changed electrically. Possibly the motor position can be flipped or the fan blade flipped to blow the opposite direction.

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Old 11-27-2010, 05:53 PM
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electrical fan problems

Thanks for this insite, I do believe there is only two wires - & + from the fan and more from it's relay box, fan is mounted on the radiator so I guess I will try flipping the fan blade to change the air flow to pull instead of push. Not sure if this fan blade can be changed or not for reversal, I will check. I do believe fan has a plastic cap over it's shaft. I have only worked on the old water pump fans, this is all new to me. But I will have to get new disc zip ties to remount the fan. Others will have to be cut to release, I think they are a one time deal when used.
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Old 11-27-2010, 06:15 PM
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if the fan came as a "pusher" new, and you installed it as a "puller" (which is what you want) then you will need to flip the blade and reverse your polarity. this will then pull the air through the radiator. you really should build some brackets for your mounts and not use the zip ties.
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Old 11-27-2010, 06:23 PM
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Electrical fan problems

Thanks Dr.
I feel stupid now I bought a pusher new and needed a puller, I am such an idot. And those zip tie things came with this fan for mounting but I agree I need to figure out some other way to include a shroud and mounting brackets would be much better and more efficent.
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Old 11-27-2010, 07:37 PM
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Or you could mount it on the other side of the radiator
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Old 11-27-2010, 07:51 PM
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On most elec fans all you have to do is switch the wires around.. They come as a pusher are a puller.. You shouldn't have to turn the blade around.. Unless you have ''ONLY'' a pusher or puller..
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Old 11-28-2010, 05:40 AM
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I wouldn't switch the fan blade around unless it was designed to do so, reverse the wires or simply mount the fan on the bumper side of the radiator so it can push the air back to the motor.
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Old 11-28-2010, 12:38 PM
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putting it in front of your radiator blocks a awful lot of airflow and causes hot spots in the radiator. fans run all the time and temp stays up. fan blades are designed to move air in one direction. only reverse your polarity and see much air it moves. NONE
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Old 11-28-2010, 12:50 PM
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I wouldn't run it on the front side..
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Old 11-28-2010, 12:56 PM
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Quote:
Originally Posted by DOCTOR DC
only reverse your polarity and see much air it moves. NONE
Man!!!! You have to be joking or something..
Sorry but that is not true... I have been doing it for years... There is very little to no difference at all..



Now I do have to say, there can be two answers for this... There is some fans you have to flip the blade,, But there is some that you can't flip the blades, But can run them in reverse..The ones I buy, all I ever had to do was reverse the polarity.. And I have done this on Hot big block chevy Motors.. AND DIDN'T RUN HOT...

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Old 11-28-2010, 02:31 PM
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Why wouldn't you run them on the front side? Many OEM cars run them that way..... Blockage of air? it has the same mass weather in front or rear, the only bad thing I can see is if you removed the stand off and mounted it right up against the fins and then it would be the same front or rear. I have run one in the front on two different vehicles with zero problems.

Reverseing the wire will in most cases cause the fan to run in the other direction.
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Old 11-28-2010, 03:20 PM
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Quote:
Originally Posted by EOD Guy
Why wouldn't you run them on the front side? Many OEM cars run them that way..... Blockage of air? it has the same mass weather in front or rear, the only bad thing I can see is if you removed the stand off and mounted it right up against the fins and then it would be the same front or rear. I have run one in the front on two different vehicles with zero problems.

Reverseing the wire will in most cases cause the fan to run in the other direction.



It will work in front, But it does restrict the air flow some.. If you run a really hot big block,, Mount it on the front, And then mount it on the back,, YOU WILL SEE THE DIFFERENCE..
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Old 11-28-2010, 03:37 PM
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350 with a rad cam...... runs fine
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Old 11-28-2010, 03:41 PM
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It is easier for the fan to pull air acrossed the radiator fins than it is to push it acrossed. If you are pushing the limits of the cooling system size with high hp engine, mounting the fan in front will have less effect than mounting it behind the radiator. Common knowledge with the 20's-40's street rod crowd with their narrow front ends.

True of all fans, easier to pull air out a window creating a vacuum through a room than it is to try to push air in from a window. A house will cool a lot faster in the evening with a fan blowing out, pulling cool air in from open windows in the other end of the house. Works the same in cars
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