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Thermo Fan Wiring

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Thermo Fan Wiring

Hi guys I am wiring up a thermo fan, I have attached the wiring diagram that came with it but what i want to do is have a switch where I can have it run off the thermo switch but also if i need to manually override it so it comes on straight away. I have shown the switch in the diagram, does anyone knwo where i wire the switch into? thanks.

Image

Unread postby superg » December 29th, 2006, 10:54 am


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Thats an LPG setup diagram

Unread postby jet-6 » December 29th, 2006, 11:18 am


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Sorry copied the wrong diagram, ive got the right one up now, any ideas how to wire the switch in? thanks.

Unread postby superg » December 29th, 2006, 1:43 pm


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run a wire from a power source, eg. battery or acc wire and put a switch in and the end of the wire goes to 86 on the relay. when the switch is turned on it will start the fan.
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Unread postby BIG PATROL » December 29th, 2006, 5:20 pm


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Why would you want to manually overide the automatic system? to much margin for overheating the engine,the thermal switch should be adjustable
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Unread postby waz65 » December 29th, 2006, 9:52 pm


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Because in the event of the thermo switch failing i want backup to be able to run the fan on command rather than be stranded with no cooling, better to have a few more wires than be stuck somewhere having to wire it up then.

Unread postby superg » December 29th, 2006, 9:59 pm


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Put the switch accross 30 and 86 in your pic

Unread postby jet-6 » December 30th, 2006, 12:01 am


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I have the wire going into 86 hooked onto the power connection of my 3 position switch.

Position 1 is hooked onto the thermal switch.
Position 3 is hooked onto a continous power supply
Position 2 is an 'OFF' position.

When the switch is up, everything runs of the thermal switch.
When the switch is in the middle, the fan is off (i.e. for water crossings)
When the switch is down the fans are continously on
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Unread postby Clown Boy » December 30th, 2006, 9:48 am


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Bingo, exactly what i was looking for Clown Boy, thanks for that! Does this pic look right now when its on 1 the fan is on all the time, when its on 2 its through thermo and when its in the middle its off, thanks mate.

Image

Unread postby superg » December 30th, 2006, 5:00 pm


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waz65 wrote:Why would you want to manually overide the automatic system? to much margin for overheating the engine,the thermal switch should be adjustable

I have an over ride on mine to switch it of if I dunk it in a creek or something

Unread postby zoomer » December 30th, 2006, 5:49 pm


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superg wrote:Because in the event of the thermo switch failing i want backup to be able to run the fan on command rather than be stranded with no cooling, better to have a few more wires than be stuck somewhere having to wire it up then.

Sorry mate , I understand where your coming from now, I ran davis craig thermos in my street and drag cars for years , never had any problems but saying that i never dunked any in water:)
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Unread postby waz65 » January 1st, 2007, 4:13 pm


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No worries mate, always good to ask and find out. Hopefully mine never fail as well.

Unread postby superg » January 1st, 2007, 5:42 pm


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Sorry mate, was off for a couple of days.

?Yes that is correct. Except for my always on position I wired a direct power supply (not off ignition).

Personal preference. I figured if I come close to overheating I can turn the engine off, leave the fans on and restart car in 10 minutes to recycle around the cooler water.

Probably not much of a difference though.
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Unread postby Clown Boy » January 2nd, 2007, 10:05 am



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