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Old 02-19-2007, 09:10 AM
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electric fan direction

When installing an electric cooling fan on the engine side of the radiator should it be wired to blow into the radiator or to suck air through it?

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Old 02-19-2007, 09:16 AM
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Quote:
Originally Posted by yragat
When installing an electric cooling fan on the engine side of the radiator should it be wired to blow into the radiator or to suck air through it?
To "suck air through it".

Blowing back into the radiator would be fruitless as the air coming through as the vehicle moves forward would counter the electric fan trying to blow back into the radiator.
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Old 02-19-2007, 09:17 AM
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According to everything I have read, and done, the most effecient way to mount a fan is on the engine side pulling air through the radiator core. Blowing air through the core from the back is not a good thing, the car will overheat on the road.
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Old 02-19-2007, 09:34 AM
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I think mine is wired wrong I think all I have to do is switch 2 wires,right?
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Old 02-19-2007, 09:49 AM
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Originally Posted by yragat
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I think mine is wired wrong I think all I have to do is switch 2 wires,right?
That should correct the direction.
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Old 02-19-2007, 11:24 AM
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Quote:
Originally Posted by pasadenahotrod
According to everything I have read, and done, the most effecient way to mount a fan is on the engine side pulling air through the radiator core. Blowing air through the core from the back is not a good thing, the car will overheat on the road.
It very much depends upon if a shroud is used.

If you are putting it on the engine side, I strongly recommend using a shroud to assist the fan in doing its job. Without a shroud on the engine side, electric fans have trouble doing anything more than stirring up under hood air.

Mounted on the outside, it is recommended to not use a shroud. As a shroud on the outside will do little in assisting how well the fans push air, and will only block a good deal of airflow when the car is moving.
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Old 02-19-2007, 12:06 PM
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I don't know what brand my fan is,but it has about 10 blades and is in its own shroud and has plastic grateing over it so u don't get fingers in it,The whole thing is only about 2" deep and is all plastic


Now I'm wondering if U have to flip the blades over when reversing direction???

Last edited by yragat; 02-19-2007 at 12:11 PM. Reason: flip blade
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Old 02-19-2007, 02:19 PM
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It depends on the type of electrical motor is has.

Some will reverse when the wires are reversed. Some will not.

So with some, you must remove the blades, and install them to opposite way.
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Old 02-19-2007, 02:54 PM
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so am I correct in assuming that if I switch the wires and the motor still turns in the same direction then I will have to reverse the blades? Another thing, it's wired to come on at 185 and also anytime the AC compressor comes on.Could I take the wire running from the fan control to the AC and run it to a toggle switch? I'm running a 4 cyl and it don't run hot so I don't see why the fan has to always come on with the compressor
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Old 02-19-2007, 03:52 PM
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Doc here,

To reverse the direction of a DC Fan motor, (provided it is NOT polarity protected by a diode or cap, ) just reverse the power and ground wires..

The blades on MOST Cooling fans are "Flat" enough of a pitch where they will run equally as well in either direction..so that shouldn't be a worry..

The biggest part is a GOOD shroud that directs air as close to the engine block as practical, and be sure hot air is not cycling around the front of the radiator. (seal the mounting area) AND good air flow OUT of the engine bay for hot air.

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Old 02-19-2007, 03:59 PM
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What about the toggle switch idea. Will it work?
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Old 02-19-2007, 04:10 PM
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Doc here,

Yes it will, If you run it in SERIES with the AC Control wire (cut the wire and install it between the cut wires) .

I'd check out HOW hot it really runs with the AC lugging the 4 cylinder engine FIRST before making anything carved in stone..you may find it is a Necessary evil..

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Old 02-19-2007, 04:43 PM
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Quote:
Originally Posted by docvette
Doc here,

To reverse the direction of a DC Fan motor, (provided it is NOT polarity protected by a diode or cap, ) just reverse the power and ground wires..

The blades on MOST Cooling fans are "Flat" enough of a pitch where they will run equally as well in either direction..so that shouldn't be a worry..

The biggest part is a GOOD shroud that directs air as close to the engine block as practical, and be sure hot air is not cycling around the front of the radiator. (seal the mounting area) AND good air flow OUT of the engine bay for hot air.

Doc
my spal fan is a puller they are finely balance to the point that the blade should not be reversed and wires switched. They have a differant fan if you want a pusher not the same fan that is reversed. This is not the case for all fans though. Ed ke6bnl
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Old 02-19-2007, 04:48 PM
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If I do it that way when I flip the toggle switch The fan will come on and still be getting juice from the ACwire,is that right?
If thats the case I wouldn't be able to manually turn the fan on unless the compressor is running.(I think) what I want to do is be able to manually turn the fan on at any time
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Old 02-19-2007, 05:00 PM
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Quote:
Originally Posted by yragat
If I do it that way when I flip the toggle switch The fan will come on and still be getting juice from the ACwire,is that right?
If thats the case I wouldn't be able to manually turn the fan on unless the compressor is running.(I think) what I want to do is be able to manually turn the fan on at any time

Doc here,

OK, I thought you wanted to be able to turn it OFF manually in AC mode..sorry my bad..

If that's the case, Find your Temp switch controller for the fan. Determine if it switches ground (Traditional) or power (non conventional)...Just for grins, assume it's ground. Hook the Center wiper of your switch to a good , properly bonded ground. The normally open side will go to the FAN MOTOR side of the switch (or the relay coil side of the switch, if using a relay).

In this configuration, it will turn ON any time you flip the switch.

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