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LX 253- Thermo Fan Controller -Davies Craig part 0400

Started by _Wozz_ , Oct 09 2021 02:38 PM

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9 replies to this topic

#1 _Wozz_

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Posted 09 October 2021 - 02:38 PM

Anyone had any experience with the Davies Craig switches/housings for a thermo fan controller?

I'm lookin at part 0400 which means you cut a short section out of the upper rad hose and fit this inline, which I would hope means no leaks.

Also would anyone know the inner diameter of the rad hose by any chance? Can find part numbers for the hoses, but not actual specs anywhere. Otherwise i'll just try a bodgy measurement

he kit i'm looking at supports 35 or 38mm ID hoses

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#2 dron

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Posted 09 October 2021 - 07:05 PM

I went for a temp switch in the thermostat housing switching a relay. A lot easier to set up and there is a good range of switches at differant temp ratings available. If you do not have any where to put the temp switch a 1/8 ntp tap and the correct drill will fix it

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#3 _Wozz_

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Posted 09 October 2021 - 10:04 PM

Oh cool thanks, that sounds like a much better idea.
So i guess something like the tridon tfs110 would do the job on 85 off 80. Never seen or used these before (still learning everything as i go!), but from the looks of things they just screw into place, then when they hit the temp, the single terminal gets earthed right?
That should be easy to wire into relay..

I think i read someone else mention this method but i had to google thermostat housing

pretty much where rad hose outlet is. Then just a new gasket if i have to remove housing to drill a hole

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#4 76lxhatch

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Posted 10 October 2021 - 05:44 AM

That's definitely the go - much neater, less chance of leaks, and you get the hysteresis (different on/off temps). Have used those Tridon switches with good results.

Not sure which engine you're talking about but directly into the manifold/coolant system under the thermostat housing is usually good, similar spot to the temp gauge sender - you may even have a spare port. Just make sure its on the engine side of the water thermostat. Yes the sender earths the wire through whatever it is screwed into.

Make sure the fan thermostat switches a bit hotter than the water thermostat too, that one might be OK if you're running a super cold 160 (71) thermostat but with the standard 180 (82) you'd be better off with something more like 95 on, 90 off. Otherwise the fans will just run constantly.

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#5 _Wozz_

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Posted 10 October 2021 - 07:14 AM

Oh ok well I'm guessing it would be a standard thermostat, its a red 253 engine, so I'll look out for a 95 on 90 off in that case!

Thanks so much for the help, this looks like it'll be a much neater finish too and less to modify. Hoping i find a spare port ready to go then!

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#6 RallyRed

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Posted 10 October 2021 - 07:54 AM

I went for a temp switch in the thermostat housing switching a relay. A lot easier to set up and there is a good range of switches at differant temp ratings available. If you do not have any where to put the temp switch a 1/8 ntp tap and the correct drill will fix it

Same here.

This solution is quite neat, whereas in my opinion those Davies C. units look like a home make kit or something.

Some things I found out when doing mine -

Bosch seems to have a good range of these sensors.

Note the 1/8NPT comment above...the sensors are a TAPER thread, i.e. a normal tap of that size won't do it. Need a TAPER tap.

As we are in 2021, there seems to be a big selection of sensors with metric threads too, however these seem to be in the 12mm + sizes and you may not find somewhere to drill and tap a hole that big?

Most switches are NOT adjustable, so think about what temp you want to switch at?

There seems to be supply chain issues as well, where a sensor may appear in the catalogue, but only Singapore seems to have any.

That is just my experience, may differ depending on where you are.

Edited by RallyRed, 10 October 2021 - 07:55 AM.

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#7 Cook

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Posted 10 October 2021 - 12:23 PM

I have a Davies Craig 0445 fitted up. I was lucky enough to have a spare port in the inlet manifold next to the temp gauge sensor. I originally had the twin thermo fans connected to come on when engine fired up but this was causing havoc with fuses and seemed the initial draw with the thermo fans was the issue. Also as has been said, good range of settings and easy to use. Tuner also said if you have A/C you can tweek it on summer months to suit. I will be mounting the controller under the glovebox but have seen a few mounted in the engine bay. FWIW I bought mine off EBay from a local seller and he was cheaper than buying direct from the supplier (go figure). Cheers Ron

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#8 _Wozz_

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Posted 10 October 2021 - 08:06 PM

So had a quick look tonight, saw below - I'm assuming this could be the temp switch that should go to the dash warning light?

Would have been a perfect port, not currently connected so I may need to go fishing around for the light wire. Guess I can make sure I got the right one if I earth it and dash light comes on (as long as I dont earth anything 12v)