kitcar007kev
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| posted on 11/4/06 at 06:42 PM |
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Hard Wire Radiator Fan
i am having problems with water escaping from the expansion tank on the cooling system. the temp guage shows 90c when up to temp but am having
problems when getting back from long runs and begin to slow down. The system looses water through the cap. i have reduced the level of water in the
tank which has cause some inprovement. But what i want to do is hard wire the radiator fan so that i can operate it manualy. if i create a circuit
that overides the thermostat with a toggle switch so that the fan can be turned on and off. Can i use 8 amp cable?? With a 10 Amp Toggle switch??
any help appreciated (being a novice)
Cheers Kev 
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k33ts
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| posted on 11/4/06 at 06:44 PM |
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you should have a relay wired via the thermoswitch all you have to do is activate that.
all you need is a small switch and small cable
have you tried replacing the cap
[Edited on 11/4/06 by k33ts]
tukcustoms.com
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kitcar007kev
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| posted on 11/4/06 at 07:06 PM |
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Cheers never thourght about getting a new cap. Doh
i have some 8 Amp wire lying around, should this be ok??
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k33ts
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| posted on 11/4/06 at 07:23 PM |
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you need to find which relay controls the fan
then you need to find out if its neg or pos switching, check at the thermo switch
which ever one it is you need to pass that through aswitch to the relay
85 and 86 is the switching side of a relay ill see if i can find a digram will maeke more sense
tukcustoms.com
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kitcar007kev
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| posted on 12/4/06 at 06:19 AM |
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i was thinking of creating a circuit that bridged the thermo switch so when switch on fan works??
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kitcar007kev
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| posted on 12/4/06 at 06:43 AM |
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forgot to mention my thermoswitch? is the type that is mounted directly on the raditor
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02GF74
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| posted on 12/4/06 at 08:41 AM |
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Take a look at this circuit; It uses a Lucas 3-way switch (on-auto-off) to control a fan via a Kenlow thermostat. Modify it for your purpose.
and how it looks when fitted.
Oh, by the way, are you having these problems when driving or when stationary? If latter, then then you have a cooling problem; too small or blocked
radiator possssibly. You could try the 'water wetter' stuff; supposed to help, and run 50/50 anit-freeze/water mix.
[Edited on 12/4/06 by 02GF74]
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blockhead_rich
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| posted on 12/4/06 at 10:01 PM |
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I could do with a bit of help too as I want to do a similar thing.
I have the Toyota water / rad fan sensor from the Mr2 and I want this to automatically control the rad fan but I also want a manual overide via a
Savage switch. I was simply going to wire two feeds (one from the manual switch and one from the sensor to the power feed side of the fan. Is this a
crap idea and do I need to fit a relay somewhere?
Fan is a Pacet item.
Rich - who has no idea about electrics!!!!!!!!! 
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kitcar007kev
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| posted on 13/4/06 at 06:23 AM |
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Glad to see i am not the only one!!
Cheers for the Help everyone
i thourght a relay was people running around with a stick!
i have decided to unconnect the thermostat/switch and extend the wires back to the dash and put a switch in place of the themo switch.
Kev
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02GF74
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| posted on 13/4/06 at 07:05 AM |
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quote:
Originally posted by kitcar007kev
i have decided to unconnect the thermostat/switch and extend the wires back to the dash and put a switch in place of the themo switch.
In my opinion that is just plain wrong; how confident you will remember to alwyas switch the fan on when needed? either have it automatic off the
thermostat or running on full time.
The circuit I shown is in a Land Rover; you need to have a manual off before wading in order to avoid damage to the fan and splashing water about.
The manul on shouldn't be required but is there because I can.
As I said originally, if you need to manuallly turn on then you have a cooling problem that needs to be addressed.
quote:
the temp guage shows 90c when up to temp but am having problems when getting back from long runs and begin to slow down. The system looses
water through the cap.
surely by that point the fan is on already on? turning it on sooner isn;t going to prevent that; it will happen but a bit later?
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Peteff
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| posted on 13/4/06 at 11:35 AM |
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What engine, radiator, header tank. Is the pressure cap on the rad or tank. What thermostat rating are you using. Take the stat out and drill a couple
more 3mm holes in the seating lip and make sure you put it back in the right way round if it's a pinto engine and undo the bleed on the top of
the stat housing when you fill it back up. I only have a manual switch on mine and don't need to use it very often at all.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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kitcar007kev
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 posted on 3/5/06 at 06:22 AM |
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its the cylinder head
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