Hi, I have a 1978 F100 V8 351.

I have two electric radiator fans which I have been in the process of making mounting brackets to fix to the radiator. I can fit the two electric fans and still have room for the stock fan. I am however going to install an AC condenser in front of the radiator (front of truck).

What are your opinions on fan requirements?
(Has any one installed electric fans, if so did you remove the stock fan?)
Thanks,

 

Most people remove the stock fan/clutch when going to electric fans but the new electric ones will need to be wired for one or both to come on when the A/C is on or your A/C won't get cold until the truck gets warm enough to start the fans on their temp setting.

Are the electric fans going to start and stop on a temp setting? If so, running the stock fan will be good to keep air flow across the condenser for cold a/c until the truck gets up to running temp.

That's awesome that you'll have the option to run both.

 

Hi, I am going to place an A/C compressor on the truck. In order to do so I will have the remove the mechanical fan as the compressor interferes with the fan blades. Of course I will then have to go with the electric fans. I am thinking of wiring the fans so they come on with the ignition switch regardless of temperature. Just like the mechanical fan runs. The thermostat would control when the radiator is used.

Can anyone see any problems with this?
Thanks,

 

It puts unnecessary load on the alternator to have the fans always come on when the ignition is on plus it will delay warm up times especially if you are in a cold clime and draws current that could be used to crank the engine.

Both fans need to come on when the A/C is on. This is for a couple reasons The condenser sits in font of the rad and has to condense/cool the refrigerant it so it can release the heat absorbed from the evaporator in the the cab of your truck and heat generated from compression in the compressor, it is condensed from a high pressure gas to a high pressure liquid in the condenser if that does not happen then the AC will fail to function correctly (not cool) and the compressor will see higher than normal head pressures, high head pressures will lead to early compressor failure.

Put the fan on a or multiple thermo switches for the coolant, and a relay tied to the AC system that will activate the fans when the AC is on.