Cooloing fan switch

[mark spit]

Hi,

After to much time not using my car other than driving to it's annual MOT due to other general life stuff taking priority I've started doing stuff to the car seeing as I managed to get the garage tidied so I can get the thing out easily now.

Many years ago I fitted an electric fan that is operated by an adjustable capilliary sensor that is stuck inside the radiator top hose, said top hose has just split and now needs replacing. I had been considering fitting a thermostatic switch into the bottom hose as that seems to be a better location for it and it can be awkward to get a good seal round the temp sensor tube.

 

I wonder does anyone have any recommendations/links for something that I can get to fit to the bottom hose? Either a sleeve with a switch that fits in it or a switch that fits direct to the hose wall.

 

Cheers

Mark

 

 

[Hamish]

Mark

if you have the space you could fit something like this

but shop around you’ll find the boss adapter and thermo switch cheaper. And in the right temp on off range.

https://www.demon-tweeks.com/lma-fan-controller-thermostat-632341/?sku=LMACF306/32&istCompanyId=a2904180-3a7d-4e56-b876-cf81c9512180&istFeedId=6fbc4b04-fd28-4ce1-8513-835c8f118690&istItemId=wptplwrii&istBid=t&gclid=EAIaIQobChMIi4Ptm4_z7AIVR4fVCh1UQwHNEAQYDCABEgKV9fD_BwE&gclsrc=aw.ds

[MilesA]

Mark

The other think you should do is give the cooling system a really robust flush to ensure best efficiency.

If you opt for a bottom hose located sensor, remember that the temperature will be lower than in the top hose (7-9 degrees in my case). So take that into account when choosing the correct thermo switch. In my TR3A I tried a number of different thermo switches (eBay is your friend) before i found a on / off combination that worked for my car (although no one seemed to offer one with my ideal on / off temperatures). 

I tested the last couple by inserting a sensor in the top hose (linked to a cheap dual sensor thermo meter). I secured the hose with two jubilees clips. Haven't got round to removing the sensor but done 1500 pretty robust miles and ironically, not a hint of a leak.

Whilst at it, you could also install a manual override switch to activate the fan when anticipating higher temperature situations (slow traffic, etc). 

Miles

[rogerguzzi]

Hello Mark

                   I fitted a dual temperature one on our Spitfire but I have 2 fans (Intermotor 50101 83-79 & 88-83) in bottom of radiator 

I fitted a small center off switch and 3mm leds in the H frame and leds come when fan does all through fused relays

Here is a list of them all

INTERMOTOR

ELECTRIC FAN SWITCHES

N.O.C. - normally open circuit
N.C.C. - normally closed circuit

Part No. A/F Size Thread Temp °C
50480 19 3/8" BSP Taper 50-46 N.C.C.
50471 19 3/8" BSP Taper 77-74 N.C.C.
50460 27 3/8" BSP Taper 90-85
50370 27 3/8" BSP Taper 95-90
50372 27 3/8" BSP Taper 100-95
50010 25 3/8" x 18 NPTF 79-74
50080 21 3/8" x 18 NPTF 88
50172 22 M14 x 1.5 87-82
50042 24 M14 x 1.5 90-85/98-93
50041 22 M14 x 1.5 95-90
50173 22 M14 x 1.5 100-95
50040 22 M14 x 1.5 103-98
50481 21 M16 x 1.5 50 OFF N.C.C.
50475 17 M16 x 1.5 60 OFF N.C.C.
50430 17 M16 x 1.5 85 ON
50320 27 M16 x 1.5 85-80
50420 21 M16 x 1.5 85-80
50432 21 M16 x 1.5 85-80
50476 17 M16 x 1.5 85-80 N.C.C.
50300 27 M16 x 1.5 87-80
50317 22 M16 x 1.5 87-82
50321 22 M16 x 1.5 88-79
50310 22 M16 x 1.5 88-86
50301 22 M16 x 1.5 90-83
50474 19 M16 x 1.5 90-83 N.C.C.
50461 21 M16 x 1.5 90-85
50421 21 M16 x 1.5 90-85
50470 17 M16 x 1.5 90-85 N.C.C.
50390 17 M16 x 1.5 90-85 N.C.C.
50316 22 M16 x 1.5 92-82
50330 22 M16 x 1.5 92-82
50453 24 M16 x 1.5 92-85
50315 22 M16 x 1.5 92-87
50341 24 M16 x 1.5 92-87
50342 24 M16 x 1.5 92-87
50371 27 M16 x 1.5 92-87
50373 24 M16 x 1.5 92-87
50450 21 M16 x 1.5 92-87
50340 29 M16 x 1.5 93-86
50374 24 M16 x 1.5 93-88
50479 17 M16 x 1.5 93-88 N.C.C.
50332 22 M16 x 1.5 95-85
50477 17 M16 x 1.5 95-88 N.C.C.
50455 22 M16 x 1.5 95-90
50454 22 M16 x 1.5 95-90
50380 17 M16 x 1.5 97-92 N.C.C.
50478 17 M16 x 1.5 98-91 N.C.C.
50375 24 M16 x 1.5 98-92
50472 17 M16 x 1.5 98-93 N.C.C.
50473 17 M16 x 1.5 98-95 N.C.C.
50431 17 M16 x 1.5 100-95
50331 22 M16 x 1.5 102-97
50100 29 M22 x 1.5 82-68
50101 29 M22 x 1.5 84-79/88-83
50250 29 M22 x 1.5 86-76
50012 29 M22 x 1.5 86-77
50090 29 M22 x 1.5 86-81
50120 29 M22 x 1.5 88-79
50295 29 M22 x 1.5 88-79
50296 29 M22 x 1.5 88-79/110-102
50271 29 M22 x 1.5 88-83
50272 29 M22 x 1.5 88-83
50275 29 M22 x 1.5 88-83
50217 29 M22 x 1.5 88-83/92-87
50091 29 M22 x 1.5 88-83/92-87
50212 29 M22 x 1.5 88-83/92-87
50213 29 M22 x 1.5 88-83/92-87
50216 29 M22 x 1.5 88-83/92-87
50221 29 M22 x 1.5 88-83/92-87
50219 29 M22 x 1.5 88-83/92-97
50240 29 M22 x 1.5 90-80
50110 29 M22 x 1.5 92-82
50111 29 M22 x 1.5 92-82
50112 29 M22 x 1.5 92-82
50113 29 M22 x 1.5 92-82/95-80
50218 29 M22 x 1.5 92-82/97-92
50170 29 M22 x 1.5 92-87
50200 29 M22 x 1.5 92-87
50210 29 M22 x 1.5 92-87
50211 29 M22 x 1.5 92-87
50220 29 M22 x 1.5 92-87
50230 29 M22 x 1.5 92-87
50231 29 M22 x 1.5 92-87
50235 29 M22 x 1.5 92-87
50260 29 M22 x 1.5 92-87
50270 29 M22 x 1.5 92-87
50280 29 M22 x 1.5 92-87
50281 29 M22 x 1.5 92-87
50285 29 M22 x 1.5 92-87
50290 29 M22 x 1.5 92-87
50215 29 M22 x 1.5 92-87/97-92
50011 29 M22 x 1.5 93-88
50102 29 M22 x 1.5 93-88/97-92
50035 29 M22 x 1.5 95-85/102-92
50130 29 M22 x 1.5 95-86
50030 29 M22 x 1.5 95-90
50033 29 M22 x 1.5 95-90
50061 29 M22 x 1.5 95-90
50062 29 M22 x 1.5 95-90
50160 29 M22 x 1.5 95-90
50092 29 M22 x 1.5 95-90/100-95
50174 29 M22 x 1.5 95-90/100-95
50104 29 M22 x 1.5 97-92
50282 29 M22 x 1.5 97-92
50103 29 M22 x 1.5 97-92/101 -96
50214 29 M22 x 1.5 97-92/102-97
50190 29 M22 x 1.5 100-95
50195 29 M22 x 1.5 100-95
50196 29 M22 x 1.5 100-95
50197 29 M22 x 1.5 100-95
50198 29 M22 x 1.5 100-95/110-105
50000 29 M22 x 1.5 103-98
50013 29 M22 x 1.5 103-98
50014 29 M22 x 1.5 103-98
50191 29 M22 x 1.5 120-115
Push in Bulb Type
50060 N/A N/A 80-75
50050 N/A N/A 87-82
50171 N/A N/A 92-82
50055 N/A N/A 95-90
50056 N/A N/A 96-88
50057 N/A N/A 110-103


Here is a Link to the Intermotor website which will give more detail including the make and model of the car it fits.

Hope this helps someone.
Roger

 

[rogerguzzi]

https://www.diycarserviceparts.co.uk/intermotor-temperature-switch-radiator-fan-switch-50101.html

oops

Roger

[mark spit]

 

Thanks for the replies, I already have a manual overide switch and picked up a boss/switch that unfortunately didn't arrive before I needed to replace the split top hose to go for MOT, I suspect there isn't a big enough gap etween the stat outlet and rad inlet to get the boss in and be able to get the hose bits on so it will probably go in the bottom hose when I get round to it with a suitably lower thermo switch.

Yours

Mark

 

[Mark]

Don't know if you have this, but there should be a thin piece of rubber with a groove in that goes between the radiator inlet and top hose. This seals the peak created by the sensor wire when fitted inside the top hose.

Should come with the kit, but I've made one in the past by melting a groove in a strip of inner tube rubber.