Help with wiring cooling fan??

8850 · 07-18-2001, 10:29 PM

I would like to wire my fan where I have two speeds. What is the best way to do this? Two relays with one resistor?

This is an 11 amp fan motor. What size resistor? Thanks!

------------------
88 347, Twisted wedge heads,Comp Cams 224/230 cam, 1/4=10.718 @ 123.02 mph dyno= http://www.fbody.com/members/LarryS/mustdyno.jpg

dinomite · 07-18-2001, 10:32 PM

11 amps at 12 volts, thats a hefty resistor. why two speeds?

[This message has been edited by dinomite (edited 07-18-2001).]

8850 · 07-18-2001, 11:10 PM

dinomite,

I want to be able to run my fan when the engine is off. If it is pulling too many amps I'm afraid my battery will discharge too quickly. And to, in cooler weather I want to only run the fans fast enough to cool the engine.

Skyman · 07-18-2001, 11:11 PM

Whats the reason of having it not run at full speed all the time. If your tryin to maximize fan life, and thermo switch would be the best choice.

I just have a switch inside which I can control as I keep an eye on the temp.

Skyler

------------------
-1989 Saleen Mustang #406-
TFS TW Heads, E-303, Edelbrock intake, 70mm TB, 73mm MAF, 24lb injectors, 1 5/8 shorties, Off Road H, 3 Chamber flows, Jaz Race seats, Back seat removed, sub-frames, Roll Cage, and a 80 shot of N20.
12.54@107.4 Motor
1.69 60'

8850 · 07-18-2001, 11:43 PM

Skyler,

A thermo switch is good but I want to be able to run it for a good period of time with engine off and without running the battery down. In other words, I want to cool it down between runs with the engine off. I'm afraid at full speed my battery will go down but yet I want full speed with engine running.

WADS56 · 07-19-2001, 12:09 AM

Unless your battery is old you can run your fan to cool the car down between runs with no problems at all. I cool mine all the way down to 140 between runs and I have a huge fan plus a electric waterpump running off of a old cheap battery with no probs.

------------------
347 W/ A-trim 6#'s, Canfield heads, out of the box Victor 5.0 intake, solid roller cam. 11.1 @123mph 1.46 60FT

93lx 5.0 daily driver
MY CAR http://www.mustangworks.com/cgi-bin/...splay.cgi?1288

07-18-2001, 10:29 PM	#1
8850 Registered Member Join Date: Nov 1998 Location: Sugarland, TX USA Posts: 161	Help with wiring cooling fan?? I would like to wire my fan where I have two speeds. What is the best way to do this? Two relays with one resistor? This is an 11 amp fan motor. What size resistor? Thanks! ------------------ 88 347, Twisted wedge heads,Comp Cams 224/230 cam, 1/4=10.718 @ 123.02 mph dyno= http://www.fbody.com/members/LarryS/mustdyno.jpg

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07-18-2001, 10:32 PM	#2
dinomite The Dude Join Date: Feb 2001 Location: Arlington, VA Posts: 1,262	11 amps at 12 volts, thats a hefty resistor. why two speeds? [This message has been edited by dinomite (edited 07-18-2001).]

07-18-2001, 11:10 PM	#3
8850 Registered Member Join Date: Nov 1998 Location: Sugarland, TX USA Posts: 161	dinomite, I want to be able to run my fan when the engine is off. If it is pulling too many amps I'm afraid my battery will discharge too quickly. And to, in cooler weather I want to only run the fans fast enough to cool the engine.

07-18-2001, 11:11 PM	#4
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	Whats the reason of having it not run at full speed all the time. If your tryin to maximize fan life, and thermo switch would be the best choice. I just have a switch inside which I can control as I keep an eye on the temp. Skyler ------------------ -1989 Saleen Mustang #406- TFS TW Heads, E-303, Edelbrock intake, 70mm TB, 73mm MAF, 24lb injectors, 1 5/8 shorties, Off Road H, 3 Chamber flows, Jaz Race seats, Back seat removed, sub-frames, Roll Cage, and a 80 shot of N20. 12.54@107.4 Motor 1.69 60'

07-18-2001, 11:43 PM	#5
8850 Registered Member Join Date: Nov 1998 Location: Sugarland, TX USA Posts: 161	Skyler, A thermo switch is good but I want to be able to run it for a good period of time with engine off and without running the battery down. In other words, I want to cool it down between runs with the engine off. I'm afraid at full speed my battery will go down but yet I want full speed with engine running.

07-19-2001, 12:09 AM	#6
WADS56 gear banger Join Date: Aug 2000 Location: CHICAGO Posts: 1,144	Unless your battery is old you can run your fan to cool the car down between runs with no problems at all. I cool mine all the way down to 140 between runs and I have a huge fan plus a electric waterpump running off of a old cheap battery with no probs. ------------------ 347 W/ A-trim 6#'s, Canfield heads, out of the box Victor 5.0 intake, solid roller cam. 11.1 @123mph 1.46 60FT 93lx 5.0 daily driver MY CAR http://www.mustangworks.com/cgi-bin/...splay.cgi?1288