Best way to hook up electric fan controller

[AZ59apacheguy]

I just got done ordering Dual ProComp 16" ( 2500 CFM per fan ) fans and a Hayden 3654 fan controller from Amazon. With this controller:
do you think it's best to have the two fans run together, one comes on at one temp and the other comes on at a higher temp, both being controlled by the thermal probe in the radiator? Or should I have one controlled by the radiator and one by the A/C clutch?

I also bought another controller that looked interesting, it's a Davies Craig 0444 with a digital display showing temps. With this controller, I can have one fan come on at a certain temp ( radiator probe ) and then the second automatically comes on 10sec later. I also have the ability to have the second fan come on with the a/c clutch.

I live in the AZ desert ( enough said ), I want the best way to cool my engine without using the traditional fan/thermal clutch. With the traditional way, I am tired of the " retarded timing, loss of power, fan roar " that has plagued us who live in super hot climates; this seems to be a cure ( or partial cure ) for this problem.

 

[stamp11127]

You can try all kinds of things to "improve" the cooling system of your vehicle. If it isn't overheating now then for the most part it will be money wasted.
From what I gather the problem is the ambient air temp of the desert is causing a loss of power due to retarded timing. Adding electric fans doesn't address this problem.
If you want to keep the power you should reduce the air temp going into the engine. There are various methods to do this but none of them are just plug - play - forget.

I have no affiliation with Summit but check this out:

https://www.summitracing.com/parts/...dFhuCIJKJ4lFOVd-GIb_NUpHDywViIxWaOhoCOHzw_wcB

Although the above is for boosted engines the principal is the same for normally aspirated engines.

Here is another link with info on just water injection:

http://www.ford-trucks.com/forums/944945-water-injection-for-gas-engines.html

 

[AZ59apacheguy]

Hi, thanks for the reply. It's more about freeing up the motor from the heavy drag of the fan clutch. Since they only make " Heavy and Extreme Duty " fan clutches with higher percentage lock up rates over Standard, it really steals pony's from the engine; I have a Heavy Duty style in my Expedition. I have read other members here go to an electric fan setup with great success.

 

[AZ59apacheguy]

I also don't see how those solutions fix what the Intake Air Temp Sensor reads, which is the cause of the " retard " in the timing. I do however appreciate you showing me those.

 

[stamp11127]

They cool the air charge through evaporation - basically a swamp cooler for your engine.
Do you know the cfm rating of your current fan blade / engine combo - is it more or less than 5000cfm?
You are not going to move the air for free, power to turn the fans will come from somewhere. Either the engine directly or the additional load on the alternator.

Checkout this thread if you haven't already:
http://www.expeditionforum.com/f42/best-e-fan-27760/

 

[Shabadoo]

I know this is a few months old but I figured I would throw in my two cents. I installed dual fans in my 2000 Expedition and wired them together, both going off of the thermal switch. It has worked great, however, doing it the way I did created an issue with the a/c. When I first turn the car on, no air is moving through the condenser so my a/c doesn't work until the fans turn on. Basically I saw two options. Wire the a/c clutch to the fan relay so whenever the thermal switch is triggered or the a/c is on the fans will be on OR wire a programmable relay so the fans will run for X amount of time when the car first starts, then the thermal switch will take over when the engine is heated. I decided to go with the relay which I will be installing soon. It's quite a convoluted setup but it makes me happy. Long story short, make sure your fans at least come on when the car first turns on or else you won't have a/c until your engine heats up or you start moving.

 

[stamp11127]

I wouldn't wire the AC side to be based on temp unless you have a thermistor in the condenser set at around 150-175 degrees. Even if you did this it would run 99% of the time.

One thing to consider is why have the OEMs wired the AC so that the fans are on when the AC is on?

 

[Shabadoo]

I agree with you on both accounts. If it's wired to the a/c it should be on/off with the a/c, not based on temp. Also, wiring it so the fans are on with the a/c is the best way to go to ensure your a/c always works. I just chose to go with a programmable relay because I wanted to play around with it.