Wiring in the electric fan to a switch?

[beefcake]

done this on other years, i'm sure it shouldn't be too dificult.

anyone done this yet

 

[chuck@evoperform]

At the PCM (I cannot remember which connector is 175B) there will be 2 wires you can tap to control the fan with a switch. One is Green/Blue in pin 34, which is the low speed control, and the other is White/Blue in pin 18 of the connector, which is the high speed control of the fan. The connector is a 70 pin.

Tap into the wire of your choice, either low speed or high, run that wire to one side of your switch, and run the other to chassis ground. When the key is on, flip your switch to the on position, and your fan will engage.

 

[beefcake]

At the PCM (I cannot remember which connector is 175B) there will be 2 wires you can tap to control the fan with a switch. One is Green/Blue in pin 34, which is the low speed control, and the other is White/Blue in pin 18 of the connector, which is the high speed control of the fan. The connector is a 70 pin.

Tap into the wire of your choice, either low speed or high, run that wire to one side of your switch, and run the other to chassis ground. When the key is on, flip your switch to the on position, and your fan will engage.

thanks

i figure even 5 minutes or so in the pits on high speed would help a ton with cooling

 

[wazslow]

I dont see it doing a whole lot if you arent also spinning the water pump. With an electric pump it would be beneficial.

 

[beefcake]

I dont see it doing a whole lot if you arent also spinning the water pump. With an electric pump it would be beneficial.

actually an elec fan especially our high speed ones do alot to cool down. you have to remember, you not just cooling the coolant, your cooling the intake, the blower, the blower tubes, etc...

 

[wazslow]

actually an elec fan especially our high speed ones do alot to cool down. you have to remember, you not just cooling the coolant, your cooling the intake, the blower, the blower tubes, etc...

Yeah, i get that. But all the coolent in the motor will still be very hot. An electric water pump does wonders. That how I had my drag radial race car setup and you could cool thing thing way down in a matter of seconds. Im sure its beneficial, just would be better with an electric water pump.

 

[beefcake]

Yeah, i get that. But all the coolent in the motor will still be very hot. An electric water pump does wonders. That how I had my drag radial race car setup and you could cool thing thing way down in a matter of seconds. Im sure its beneficial, just would be better with an electric water pump.

i agree, i had a similar set up on my 10.7 lightning, most of the time, i'll be bracket racing hot. but for e.t. runs. a lil cooldown won't hurt

 

[TimMcc]

I was just going to make a thread about this so I can run my fan with the key on to cool the Whipples heat exchanger fluid.

Thanks!

 

[Sky Render]

Yeah, i get that. But all the coolent in the motor will still be very hot. An electric water pump does wonders. That how I had my drag radial race car setup and you could cool thing thing way down in a matter of seconds. Im sure its beneficial, just would be better with an electric water pump.

Convection causes coolant to circulate even when the motor is off.

 

[chuck@evoperform]

Convection causes coolant to circulate even when the motor is off.

You sir are correct.

 

[beefcake]

At the PCM (I cannot remember which connector is 175B) there will be 2 wires you can tap to control the fan with a switch. One is Green/Blue in pin 34, which is the low speed control, and the other is White/Blue in pin 18 of the connector, which is the high speed control of the fan. The connector is a 70 pin.

Tap into the wire of your choice, either low speed or high, run that wire to one side of your switch, and run the other to chassis ground. When the key is on, flip your switch to the on position, and your fan will engage.

u were right on. worked great

 

[chuck@evoperform]

 

[dieselboy28]

Are these wires by chance the same on the 05-09 cars? I would like to so a simple ground switch to engage fans instead or wiring auxiliary power to it.

Thanks

 

[chuck@evoperform]

Similar, but not the same.

Low speed will be dark blue at pin 6 of the ECU connector (not sure which connector, but if you match the pin location and wire colors on the same connector, you have it), and high speed will be light green/violet at pin 7 of the same connector.

It is in different locations for other years, but as I see you have an 06, thats what I looked up.

 

[GeorgeInNePa]

At the PCM (I cannot remember which connector is 175B) there will be 2 wires you can tap to control the fan with a switch. One is Green/Blue in pin 34, which is the low speed control, and the other is White/Blue in pin 18 of the connector, which is the high speed control of the fan. The connector is a 70 pin.

Tap into the wire of your choice, either low speed or high, run that wire to one side of your switch, and run the other to chassis ground. When the key is on, flip your switch to the on position, and your fan will engage.

u were right on. worked great

Is that pin 18 or 34 counted down from the top?

 

[chuck@evoperform]

Im not sure, there is a number at each end of each row.

 

[GeorgeInNePa]

Im not sure, there is a number at each end of each row.

Didn't know that.

Thanks.

 

[DTony]

I just finished doing this. Thanks for the info, it works like a charm.

 

[vakane]

Isn't it better to do a thermostat that goes off at a lower temp?

 

[Sky Render]

Isn't it better to do a thermostat that goes off at a lower temp?

The thermostat is different than the fan.

The fan is controlled by the computer, not the thermostat. The thermostat is a mechanical device that controls when the coolant flows through the radiator.

The purpose of wiring the fan to a switch is to activate it when sitting in staging lanes at the drag strip.