Need Help with E-fan setup....

[MrZ71man]

I have a set of aftermarket electric fans that draw alot of air and alot of amps. Currently, they are controlled from a stand-alone unit that turns on at about 185-190 degrees. I want to control the fans by the pcm.

What I need to know is how to wire them up so one turns on at a certain temp (lets say 185) and then the other turns on at a higher temp (lets say 200). How do I do this and what pins do I tap into on the PCM?

Thanks for the help!!

[hquick]

OK...send me an email and I'll send you the drawings to do the 3 relay wiring.
hquickatbigponddotcom

In the mean time...here's a 4 relay wiring setup I found online.

[hquick]

Hope this helps.

[Chevy366]

Here are some more http://forum.efilive.com/showthread....highlight=fans post #15 and 16 .

[MrZ71man]

Here are some more http://forum.efilive.com/showthread....highlight=fans post #15 and 16 .

I don't understand the difference of "Low speed - both fans in series" and "High speed - both fans in parallel"...What is the difference between series and parallel (besides on is low and one is high speed )

Will running these fans at lower speeds ruin the motors? Are they designed to only run at a certain amperage? They are flex-a-lite if that matters.

Thanks again for all the help!

[hquick]

At low speed they basically split the voltage so they get 6v each. At high speed they get the full 12v.
As far as I know, they will be fine.

[Chevy366]

I don't understand the difference of "Low speed - both fans in series" and "High speed - both fans in parallel"...What is the difference between series and parallel (besides on is low and one is high speed )

Will running these fans at lower speeds ruin the motors? Are they designed to only run at a certain amperage? They are flex-a-lite if that matters.

Thanks again for all the help!

Look and see if in the description of the fans if in RPM it says "Variable" you will be OK .
Specifications


280, 282 puller fans

Mounting Surface Required


17" x 31 7/8" x 4 1/2"

Fan Diameter


Dual 15"

Fan RPM @13.5VDC


Variable

Number of Blades/Fan Blade Angle


8/26°

Airflow-Cu. Ft./Min. at 0º Static Pressure


3300-5500

Amp Draw


28

Mounting System


Custom Adj. Brackets

Adj. Thermostat 180º-240º


Yes

Air Conditioning Relay


Yes