Radiator Fan Controller Question

[sailsmen]

I am installing the Flex-a-lite 480 twin fans to replace the OEM Rad Fan.
Question - I am using the Flex-a-lite controller, will that cause a problem with the PCM not seeing that the fan is working? If so how do you tell the PCM the rad fan is working?

[FordNut]

There is a parameter in the tune.

[justbob]

I thought you could wire the stock one to twins?

[sailsmen]

Does anyone know if the OEM controller is variable and the amp rating?

[Marauderman]

Ghee--I just replaced my OEM fan controller that went bad with an OEM replacement-------this is a good question--

[FordNut]

The OEM controller has 3 input wires, a +12v, a 12V rtn, and a PWM control signal from the PCM. The control signal is what produces the variable speed, it works similar to the fuel pump control. There is a parameter where you can select varible speed fan in the tuning software, if you unselect that parameter the PWM output signal is no longer sourced from the PCM, similar to when you select return style fuel system. I'm not sure what the control signal changes to, I assume it becomes an on/off signal to control a relay which then controls the fan.

[sailsmen]

Thanks Brian

[4play]

I thought the factory fan had more then enough flow no?

[sailsmen]

More HP = more heat. I live in an area w/ high humidity and heat.
Put an intercooler or heat exchanger blocking the Rad and using an open fan shroud means in certain conditions there is not enough air flow over the Rad to evacuate the heat.

The OEM Fan and Shroud are an intregal unit. The shroud is designed to max air flow over the Rad. Due to the S/C and BOP I cannot use the OEM shroud and the Mustang open shroud does not pull enough air over the Rad in certain conditions, ambient over 95*/A/C On and 20-40mph.

The idiot guage does not move until ~240*.

[Zack]

You are wasting time and money and ultimately doing NOTHING in terms of cooling with your new fan idea.

Do what I tell you and buy a Reische 170 Stat and your problems will go away.

How can Cobras across the country in ever demographic have NO issues with the same fan and a smaller radiator?

www.reischeperformance.com

A 180 stat doesnt open fully until around 200 degrees, thats the problem. Dont believe me, test it yourself...I sure did.

Spend the 50 bucks, install it and thank me later.

[sailsmen]

I will try the thermostat. It is not the size of the fan but the shroud. The open fan shroud only draws air across a small are area.
The OEM fan and shroud would work. They don't fit due to the S/C head and BOP. To make the OEM shroud fit would chop it up to the point where it draws the same air as the open fan shroud.

From Reisch web site;
"Most people think a larger radiator will improve the capacity of the cooling system but a big factor that is often overlooked is airflow. Increasing airflow will have a dramatic effect on the cooling ability of any radiator which is why most choose to do so when prepping a vehicle for race use. Some common ways to get more air through the radiator are:

•Increase the size of the lower air dam
•Box in the radiator to force air to flow through it and not around it
•Additional hood and fascia vents
•Additional or more powerful cooling fans
This is also why you never want to remove the lower air dam on a modern vehicle. Not to mention it will reduce the life of the radiator fan(s) and could even cause overheating."

[Zack]

I will try the thermostat. It is not the size of the fan but the shroud. The open fan shroud only draws air across a small are area.
The OEM fan and shroud would work. They don't fit due to the S/C head and BOP. To make the OEM shroud fit would chop it up to the point where it draws the same air as the open fan shroud.

From Reisch web site;
"Most people think a larger radiator will improve the capacity of the cooling system but a big factor that is often overlooked is airflow. Increasing airflow will have a dramatic effect on the cooling ability of any radiator which is why most choose to do so when prepping a vehicle for race use. Some common ways to get more air through the radiator are:

•Increase the size of the lower air dam
•Box in the radiator to force air to flow through it and not around it
•Additional hood and fascia vents
•Additional or more powerful cooling fans
This is also why you never want to remove the lower air dam on a modern vehicle. Not to mention it will reduce the life of the radiator fan(s) and could even cause overheating."

Thats all great what you posted. Put the thermostat in and watch your problems disappear.
Make sure your 'tooner' adjusts your fan settings per the Reische recommendations.