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rad fan relay?
nick205 - 5/2/05 at 09:57 AM

Should the cooling fan be wired through a relay? If so should the relay go near the fan, with a long feed cable/short switch cables or is it better to have the relay near the battery and have longer switching cables?

Also if I want to wire in a manual overide switch, can I wire it through the same relay or do I need a second one?

Hope that makes sense!

Nick

flak monkey - 5/2/05 at 10:14 AM

Part of the answer to your question can be found in the topic about 8 down the page... 'rad fan relay needed'...

David Jenkins - 5/2/05 at 04:18 PM

It's a good idea to wire the relay to the permanently live side of the power as well, so that it can come on whether the ign switch is on or off. This helps to cool the engine down when you park it.
Doesn't half make you jump though when you walk away and the fan suddenly starts to roar!

David

[Edited on 5/2/05 by David Jenkins]

nick205 - 6/2/05 at 10:38 PM

good tip on having it permanently fed David

I think I have it sussed - just need time to get it done now!

Cheers

Nick

indykid - 7/2/05 at 12:54 AM

hope you've got a strong battery

it killed my donor battery in a very short space of time. not tried it with the calcium yet

tom

stevebubs - 7/2/05 at 02:57 AM

quote:
Originally posted by David Jenkins
It's a good idea to wire the relay to the permanently live side of the power as well, so that it can come on whether the ign switch is on or off. This helps to cool the engine down when you park it.
Doesn't half make you jump though when you walk away and the fan suddenly starts to roar!

David

[Edited on 5/2/05 by David Jenkins]


I did this, and even plumbed it in on the feed side of the main "kill" switch (not going to be using the car for competitions).

Guess who then forgot to turn it off when he was getting on the ferry last year! Now wired in a warning light.

David Jenkins - 7/2/05 at 08:17 AM

No - I don't mean that it should be wired to come on permanently - only that it CAN come on if the thermostatic switch decides it's needed.
On my engine it will only come on for a couple of minutes, if needed when the engine's stopped.

David

stevebubs - 7/2/05 at 09:18 AM

Don't think anyone is recommending it's permanently on - just that power is provided regardless of the ignition switch(the relay will switching it on/off in conjunction with the fan / override switch)

My misfortune was because I pressed the over-ride switch while waiting to board the ferry, and forgot it was on (Couldn't hear the fan over the noise of the ferry).

Stephen

David Jenkins - 7/2/05 at 09:37 AM

quote:
Originally posted by stevebubs
Don't think anyone is recommending it's permanently on


Just checking!

David