What temp to cut in thermos?

[Range Blitzer]

I have installed thermos on my 82' Rangie and want to instal a temp cut in switch threaded into the manifold, but i'm not sure what temp switch to get. I know the thermostate is rated at 78 - 83 degrees, so should you have the thermos cut in after the the thermostate opens, say 85 -90 degrees or the same? Not even sure yet what if any variety there is in these switches. Any opinions welcomed!
Robert.

[PhilipA]

I would have it about 5C over thermostat fully open.
Regards Philip A

[350RRC]

Hi,

Plenty of switch info here:

Outer Limits 4x4 Board :: View topic - Thermo fan info (http://www.outerlimits4x4.com/phpBB2/ftopic147839.php)

You can get an alloy tube with one or two threaded holes for senders that you fit as part of the top radiator hose. (i.e. cut a section out of the hose and fit the tube with hose clamps)

cheers, DL

[Lucus]

My main fan cuts in at 93 and off at 91, the secondary cuts in at 95 and out at 91. This seems to stop too much heat getting into the rad when towing up hill. I occasionally see 108 to 110 but it drops down quick once the loads off. Coasting down hill with this setup wuill often see the coolant temp drop down below thermostat opening temp (sometimes down to 83deg) so the fans allow plenty of flow when off. Im using ea falcon fans

[Phantum]

I don't want to take your thread over but I have a question the same.

I have a thermo fan fitted to the defender only 14" not big enough:mad: (getting 16"). My question is, Is the ajustable switch that you get with the Davis C fan any good or am I better off getting a fixed temp sender for the fan. And what temp?

Regards

[maggsie]

No problems with the DC adjustable thermostat so far, been fitted for approx. 18 months.
Regards
Maggsie
04 V8 Disco
85 V8 County

[LOVEMYRANGIE]

On at 90, off at 85.
just make sure as said before the thermostat opening temp is less than the fan cut off by 3-5 degrees.

Cheers
Andrew

[Lucus]

Are you running an 82deg thermostat Andrew?

[LOVEMYRANGIE]

Are you running an 82deg thermostat Andrew?

Certainly am!
I changed the switch on my thermo housing to the above, removed the original condenser fans and wired the thermos up to that.
They come on at 90 via the switch and automatically via the A/C.

Cheers

Andrew

[dobbo]

I want to mount some twin thermos on the front of my radiator to assist the mechanical fan, whilst on the beach or low range stuff. Is it a case of just getting some ford type thermo's and reversing the wiring so they blow instead of suck or do I need to dismantle and reverse the props?

[djam1]

David Hardcastle in Tuning Rover V8 Engines is of the view that the coolant temp of a Rover V8 should NEVER exceed 80 Degrees.
The reasons stated are to do with block expansion etc. personally I cant see how this is possible in Australia also a bit strange when the manufacturer put thermostats in that were well above this temp.
Not saying that this is right, I have tried to do it and keep it reasonably close on a Gas /Carb engine in a hot climate running a 74 Degree thermostat.
You cant do that with a fuel injected model though from what I understand

[PhilipA]

I want to mount some twin thermos on the front of my radiator to assist the mechanical fan, whilst on the beach or low range stuff. Is it a case of just getting some ford type thermo's and reversing the wiring so they blow instead of suck or do I need to dismantle and reverse the props?

IMHO just get 2x Calibre 10 inch or 12 inch from Supercheap or whatever fits, as the feature of the Falcon fans is the correct shroud for pull through which you cannot use on the front.

Not all fans are designed to be able to reverse the blades which you should do . Calibre are set up for push. If you do lots of off road , do not mount them via the through fin pins, but either put bars across or make up solid mounts.
Regards Philip A

[rovercare]

I want to mount some twin thermos on the front of my radiator to assist the mechanical fan, whilst on the beach or low range stuff. Is it a case of just getting some ford type thermo's and reversing the wiring so they blow instead of suck or do I need to dismantle and reverse the props?

If it needs help being an N/A especially, there is something wrong in the cooling system, just find and fix it:D

[rovercare]

Thermo's should be cut and out above thermostat, usually moreso depends on what switch is available to suit the position really, all automotive joints should have a pretty book, with coolant switch with all kinds of temps and threads

[disco63]

Go to the "tridon web site( distributors for dozens of fan switches temp senders etc) to see thermo fan switches, all types of switches. Type in make and model in Triton search bar or search site for "fan switch"

[350RRC]

Go to the "tridon web site( distributors for dozens of fan switches temp senders etc) to see thermo fan switches, all types of switches. Type in make and model in Triton search bar or search site for "fan switch"

Already posted, and thanks to Chimpboy for doing the yards on OL.

Hi,

Plenty of switch info here:

Outer Limits 4x4 Board :: View topic - Thermo fan info

You can get an alloy tube with one or two threaded holes for senders that you fit as part of the top radiator hose. (i.e. cut a section out of the hose and fit the tube with hose clamps)

cheers, DL