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Aug 24th, 2023
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During MOT the garage rang to say there is a water leak from the fan thermostat fitted into the bottom of the radiator. When i got there they showed me a perished rubber grommet, the thermostat bulb and a simple hole in the radiator. They explained that the only seal for the thermostat in the hole in the rad was friction and this was an explosive failure waiting to happen. Current situation no fluid in system 25mm hole in bottom of rad. Any thoughts please?
Last edited by Ken A; 05/05/16 04:27 PM.
Ken A.
Plus 4 2009 Centenary Metallic Red
Plus 8 1994 Dark Green (prev)
Honda CB100 The Big One
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Sorry, not qualified to answer this one but I'm sure someone will be along soon with options for fixing. Just an observation (and exactly what my local mechanic warned me about) but just as well you didn't put that expensive Evans coolant in a few weeks back.....  James
Aero8 , Series 1 - Boston Green
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Yep they are shocking...
I've had one explode on me, luckily I'd just got back to the workshop
It's why I and the other aftermarket Morgan Radiator manufacturers use a screw in style fan switch.
Simon @ SiFab.co.uk
Simon @ Sifab.co.uk
Sifabtemporary@gmail.com
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Sorry, not qualified to answer this one but I'm sure someone will be along soon with options for fixing. Just an observation (and exactly what my local mechanic warned me about) but just as well you didn't put that expensive Evans coolant in a few weeks back..... James Very true, glad i was steered away from Evans
Ken A.
Plus 4 2009 Centenary Metallic Red
Plus 8 1994 Dark Green (prev)
Honda CB100 The Big One
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Yep they are shocking...
I've had one explode on me, luckily I'd just got back to the workshop
It's why I and the other aftermarket Morgan Radiator manufacturers use a screw in style fan switch.
Simon @ SiFab.co.uk Do you know where the "screw in " fan switch is available?
Ken A.
Plus 4 2009 Centenary Metallic Red
Plus 8 1994 Dark Green (prev)
Honda CB100 The Big One
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Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
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Top LHD corner. This is the one I have and it is a really well crafted unit and keeps the temperature well controlled with the bigger fan. It came with the car when I bought it 2 years ago and would estimate it has done 12 years service at least. Williams also have one produced for them that has seen good reports on here also, as to prices I haven't checked. good luck with whatever you decide.  http://www.mulfab.co.uk/our-products/22/...-radiators-road
Last edited by 4/4sportsfun; 05/05/16 05:31 PM. Reason: 1972 - 2004
2009 4/4 Henrietta
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The one fitted in my plus 8 had a stainless clip that held the thermostat in, but I was still not happy so I fitted a Mulfab rad with a screw in thermostat.
Martin (Deano)
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If your not planning a radiator change just yet you can 'belt and braces' the OE switch with some carefully placed cable ties through the radiator cooling tubes and by making a 'H' from cable ties around the sensor. Not an ideal fix but better than relying on it just sitting in a rubber grommet!
BR Colin
Who used to be a Spanner Juggler
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Just spoke to the garage, they are confident they can braze a screwed boss onto the rad and then fit a screwed thermostat. Does anyone know the switch temperature, i guess it will be a standard, but best to check
Ken A.
Plus 4 2009 Centenary Metallic Red
Plus 8 1994 Dark Green (prev)
Honda CB100 The Big One
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Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
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Stick it in a saucepan of warming water with your jam thermometer and see when it switches - add a couple of flying leads first and connect a meter on continuity or batteries and a lamp in series with the otter switch if you don't have one.
Make sure the otter switch head is immersed and not in contact with the pan at all.
Probably somewhere in the range of 82 - 98C.
Only rely on the rising switch action not the falling temperature (hysteresis) and do at least 3 runs for a mean.
If I had to guess it would be 88C.
Last edited by 4/4sportsfun; 05/05/16 06:46 PM.
2009 4/4 Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Connaught Green +8 prev
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