Relay location?

Hi guys, I finally got all the parts to upgrade my cooling system. Freeway speeds and stop and go traffic here I come.

I got new aluminum radiator and electric fan waiting at my parents place.

I picked up a Hayden 3647 fan control,
My question is where is best placement for relay to keep dirt and water out of it?
Side of grill?fender? Firewall? Other?

My next question is if I wanted to use a toggle switch? What would the switch be called if I wanted auto, on and then off?

I assume I can wire the on part to the A/C override so it's always on, and use the auto part attached to ignition, while the off part I'm not sure yet but I think I can figure it out.

 

Double pole triple throw switch (three position switch). One position off, one position the thermal controller goes through and the third position bypasses the controller. Each position has an in and out position on the electrical connections. Unneeded in the off position.


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Re the relay placement, did they supply a relay with the fan kit? It should be a waterproof relay spec'd for this purpose. The cheap Bosch/Tyco relays come in both standard and waterproof models, with a price difference.

I would think that mounting the relay on top of the inner fender, up away from any splash, would be the best place for it. High on the firewall would probably work too.

If you want, you can put the relay inside a waterproof box that would give additional weather and splash protection. http://www.hammondmfg.com/1550W.htm

If you need to connect the AC override to the fan switch, put a diode between the switch and the source, so that the fan signal does not backfeed into the AC.

 

thanks guys,
I now know what type of switch, at this moment I will just wire up without switch.

as far as this diode goes got any recomendations?

that is a really cool little box I like it, I don't think the relay is waterproof but the sensor/relay housing is sealed up pretty good.

 

I think your question is - can you use the air conditioning override on the controller to connect to the manual always-on position on the 3-pole switch? Yes.

You only might need diodes if you actually have air conditioning, and you want to have the manual override, and also connect the AC override.

 

yes thats the question

oh thats good that you don't need a diode, one less part.

yeah I wish I had a heater, maybe a ac for on board air but no ac.

 

If the relay is between the controller/power source and the fan there should be no need for a diode. the relay should open and break the circuit.