Folks, I'm moving along with my 351w in my 52. I want to run an electric fan. I have some dumb questions. in the past I've only used electric fans for backup and pusher style units. this will be my first main fan system. where is the better place to install the temp sensor switch in the block or the radiator?? If I go with the radiator I'll use a probe style but where does the block style go and how do choose the correct range? I have a 185deg thermostat. Is that correct for this engine setup?

bob

 

Hey Bob,

I'm not terrifically up to speed on the electric fans as far as cooling. But I'll bump this back up for you.

If you don't get the answers you need talk to Sam (Sdetweil).

 

I used a probe switch near the top of the radiator. It works very well. If you don't already have the switch, I used a Hayden kit (pn 2652) that I found at Pep Boys. It includes the probe, relay and basic instructions. The same kit is available from the Summit catalog.

 

Yep, the temp probe at the top corner of the radiator, and works great.

 

i used this one from speedway motors
it uses the temp gauge as the sender and has **** on it to make adjustments to when the fan goes on and off. easy to set up and you can turn the fan on manually with the ****.

Electric Cooling Fan Controls

 

I used one from Advance Auto Parts and it works great. Radiator probe with adjustments for high and low temps. Easy install and not expensive.

 

personally i hate those push in the fins style sending units.....unreliable and off. new cars use electric fans as primary coolers and how many do you see with those type of sending units......none. in the past on customers cars and on my flathead (dist in the way of the stock fan) i run the sending unit in the block/head. my flathead runs a hotronics relay and sending unit and hasn't missed a beat, comes on when it should and goes off when it should. remember to use a good relay as the fans pull some amps.

Hotronics

 

The Push into the radiator fins sender works great. I have it on my Navigator and have checked the temp/fan operation with an infra red thermometer several times and its been working flawlessly for the past 4 months now.

 

Thanks all for the input. With a 185 thermostat what should the temp sensor be set to start and end?

My ez wire fuse box has a 30 amp relay built in it so I had planned to use that.

Also, I found a 6 blade flex fan here and with my rad in place it lines up well, I may just have to go this route until I can recover from other expenses..

 

I have mine set at 195 on and 175 off. My gage stays slightly below half way at all times and my engine seems happy and that makes me happy.

 

I'll be using a 160 degree thermostat and the sensor turns the fan on at 185 and off at 170.

 

I have the probe type that goes in the radiator. Is there a way to convert that to use the temp sensor in the block?

 

I use this same controller for my fans..

I actually use this relay control to control a local relay with direct power from the battery..
this reduces the power load thru the fusebox..

the sender in the intake manifold has varying degrees of ground resistance, and this allows you to adjust the time for the fan to kick on..

I currently use a 180 degree stat with my 460, but may move up to the 195.

sam

 

My probe under the top rad hose style (to long ago to remember what kind) that I was using as an auxiliary to a flex fan stuck on one night. It was still running the next morning, Put a switch on it instead.