Flex-Fan (Non-Electric) Bad For Gas Mileage

cobraetti · November 5th, 2006, 05:59 PM

I have heard that a flex-fan can decrease gas mileage

mdvaldosta · November 5th, 2006, 06:05 PM

Only if you remove the fan clutch. Otherwise it should improve gas mileage / performance. The best thing is to get an electric fan, then there's no load on the engine to restrict power or MPG.

ChrisJ · November 6th, 2006, 01:48 AM

Yep electric fan ftw

Tony_90fox · November 6th, 2006, 02:46 AM

I have an electric fan on my parts car. I am going to put it on my 90. but there are so many wires. If anybody could help me by telling me what wires to remove and how to install it on my 90, i would be greatful. All the sites i have found about this do not have pictures and just confuse the hell out of me.

ChrisJ · November 6th, 2006, 04:56 AM

You can do it several ways...

You can run it off a switch or a relay...

I used to run mine off a switch inside the cab...That way I knew that it was on...But you can run it off a relay that will only come on when the car key is turned...

Hopefully someone can give you a more detailed explanation though...

Tony_90fox · November 6th, 2006, 05:55 PM

wouldnt a relay be better? A relay would tell it to turn on at a certain temp right? and when the key is off it can just cool itself. I figure i would forget to flip the switch and my car get pretty hot.

mdvaldosta · November 6th, 2006, 06:33 PM

No a thermostat tells the fan to turn on / off. A relay is the "proper" way to route the power. Use the relay, either remote the power using a switch (ignition of flip) or thermostat (your choice).

niggadrew · November 6th, 2006, 11:17 PM

Originally Posted by Tony_90fox

wouldnt a relay be better? A relay would tell it to turn on at a certain temp right? and when the key is off it can just cool itself. I figure i would forget to flip the switch and my car get pretty hot.

on my car i have a relay and i ran a little LED light to my a pillar where i have my watter temp gague and my oil pressure gague and when the fan turns on the light shines bright

Tony_90fox · November 6th, 2006, 11:41 PM

Originally Posted by niggadrew

Originally Posted by Tony_90fox

wouldnt a relay be better? A relay would tell it to turn on at a certain temp right? and when the key is off it can just cool itself. I figure i would forget to flip the switch and my car get pretty hot.

on my car i have a relay and i ran a little LED light to my a pillar where i have my watter temp gague and my oil pressure gague and when the fan turns on the light shines bright

thats sounds neat.

sweet03cobra · November 26th, 2006, 06:41 AM

so where do you hook up so it works off the thermostat? I'm goign to put a electric fan on my 91. Any write ups on this?

November 5th, 2006, 05:59 PM	#1
cobraetti Regular 2001 svt cobra no way (IRS) Join Date: Aug 2006 Location: goose creek,sc Posts: 257	Flex-Fan (Non-Electric) Bad For Gas Mileage I have heard that a flex-fan can decrease gas mileage

November 6th, 2006, 01:48 AM	#3
ChrisJ MuchCoolerThanGTsetGO 2002 Mustang GT SLOW Join Date: Jun 2006 Location: Shepherdsville, Kentucky Posts: 16,395	Yep electric fan ftw __________________ My Junk www.myspace.com/cjobe

November 6th, 2006, 04:56 AM	#5
ChrisJ MuchCoolerThanGTsetGO 2002 Mustang GT SLOW Join Date: Jun 2006 Location: Shepherdsville, Kentucky Posts: 16,395	You can do it several ways... You can run it off a switch or a relay... I used to run mine off a switch inside the cab...That way I knew that it was on...But you can run it off a relay that will only come on when the car key is turned... Hopefully someone can give you a more detailed explanation though... __________________ My Junk www.myspace.com/cjobe

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November 5th, 2006, 06:05 PM	#2
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,943	Only if you remove the fan clutch. Otherwise it should improve gas mileage / performance. The best thing is to get an electric fan, then there's no load on the engine to restrict power or MPG.

November 6th, 2006, 06:33 PM	#7
mdvaldosta Maintenance Man 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,943	No a thermostat tells the fan to turn on / off. A relay is the "proper" way to route the power. Use the relay, either remote the power using a switch (ignition of flip) or thermostat (your choice).

November 26th, 2006, 06:41 AM	#10
sweet03cobra Look Ma! My First Post! Join Date: Nov 2006 Posts: 1	so where do you hook up so it works off the thermostat? I'm goign to put a electric fan on my 91. Any write ups on this?

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