Thread: Electric Fan sending unit

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Hey guys, has anyone had any experience with the electric fan temperature probes that go into the radiator fins? I have two coolant ports on my edelbrock Victor Jr intake, but they are taken up by the ECT and the dash temp guage senders. (i had the carb manifold converted to EFI, thats why i have an ECT). I know they cant be as accurate as the ones that sit in the coolant, but has anyone tried them - thanks

Originally Posted by Albrainya

Hey guys, has anyone had any experience with the electric fan temperature probes that go into the radiator fins? I have two coolant ports on my edelbrock Victor Jr intake, but they are taken up by the ECT and the dash temp guage senders. (i had the carb manifold converted to EFI, thats why i have an ECT). I know they cant be as accurate as the ones that sit in the coolant, but has anyone tried them - thanks

I'm assuming its a 350 Chevy. motor so there should be a plug in the head for a temp. sender unite, if not you can run the probes into the water hose and tighten it down good, or tape it to the hose, or run it in the radiator and it should be OK.

no, its a 1993 5.0 liter ford v8- no coolant ports on the heads or block. the only two in the intake are used up. i ordered the probe from summit, its supposed to go into the radiator fins, dont know if they are that accurate. I was thinking about getting the thread in style and threading it into the radiator where the drain petcock goes, but i dont think that would be an accurate representation of actual engine coolant temperature, since the coolant in the rad is cooler than in the block.

Originally Posted by Albrainya

no, its a 1993 5.0 liter ford v8- no coolant ports on the heads or block. the only two in the intake are used up. i ordered the probe from summit, its supposed to go into the radiator fins, dont know if they are that accurate. I was thinking about getting the thread in style and threading it into the radiator where the drain petcock goes, but i dont think that would be an accurate representation of actual engine coolant temperature, since the coolant in the rad is cooler than in the block.

I think it will be OK. I worry more about the temp. staying consistent than anything else, so ounce you get the first reading and its stays close to that, them it should be OK.

Do yourself a really big favor and buy a spacer with two outlets that goes between your intake and your water neck. It will give you two additional ports for sending units. And then buy one of these:
http://www.centechwire.com/catalog/a...ies/fc2p.shtml
I have this set up on my street rod and it works great, and you can dial in a temperature for the fan to come on. The unit is not bigger than a pack of cigarettes and very easy to install. The units that push into the radiator fins are not that accurate, and you will not get accurate temperature reading if you put a sensor in the petcock as that is reading cooled fluid.

I have an adjustable thermostat fan control unit with a probe that goes inside the radiator neck. It has a little rubber shim that the probe tube lays in, then the radiator hose goes over that. It works well, I no longer need it as I am having my engine computer control the fans now. I will sell it for $35 shipped if you are interested. I have the instructions for it as well. PM or email me at p.dilling@comcst.net if you would like a picture or more info.

You should also set up a relay for your fans so the full load of the fan does not have to go through the control/switch.

Pat