Hi, can I hard wire a thermo fan to the battery, i have tried this just to see if the fan works and it does quite nicely, but am scared that with prolonged use it will burn out something, i have a switch on the dash but it is not run through any relays or fuses. Cheers

You might cook something if the air direction is wrong. I've seen fans burnout on installs where this wasn't checked...

Davies craig fans are designed to be put on the front of a car, If you want to replace the waterpump driven fan by putting the fan on the back of the radiator, you need to flip the fan on the electric motor.

I would always recommend you pay $2, and fit a 15 amp fuse inline. Fires aren't fun...

Chris

This one fits quite nicely behind the grille, its a davies craig fan, 10 inch i think, all i did is put some spacers behind the radiator so its closer to the engine fan, its only cable tied at the moment, not driving anywhere until all done anyway. I checked to make sure its not going the wrong way, its pushing air into the engine bay through the radiator, is this correct? I will by a inline fuse tomorow. Cheers mate

Yep..if it's behind the grille, then no problems.

If you'd mounted it in the engine bay side, and you'd gone along a freeway with it going backwards, you'd blow fuses and if you weren't thinking properly, it would take a while to figure it out.

So it sounds ok, but putting a fuse in is a good idea. Make sure you use some nice thick wire to suit. You will need to extend the wiring, so make sure that your wire is the same size as the wire that ships with the fan.

Good one,
Chris

you must run it form behind a relay. get yourself a thermal switch (about 60$ from daviescraig or repco etc) run the thermal switch to power on the fan when it gets hot enough. i have also put an override switch in the cabin with an LED. the LED comes on whenever the fan is activated and the override switch can be used at anytime to power on the fan. i do not have a switch to manually turn off the fan, as its controlled by the thermo switch.

Cheers guys,
i bought a thermal switch from sprints today, it'll give me something to do christmas day when all the rellies start to get on my nerves. no more rising temp gauge when sat in swealtering heat in peak hour traffic.

Sean