Talk Morgan Forums Thread Like Summary - New Roadster V6 Radiator

Can anyone help help me. I need to buy a new Radiator for my 2008 Morgan Roadster V6

This thread has reminded me that it’s time to check my coolant’s electrolyte properties. My coolant is a good 3 years old now. Ali rads can rot from the inside out owing to galvanic corrosion with increasing speed once the coolant starts to degrade, picks up sludge and becomes more conductive. A poor ground might be another reason for stray currents lurking in the rad too.

I’ve installed radiators built by both Peter and Simon and they were both excellent quality. Whilst constructed using a sturdy gauge ali, I would guess that the cores are just regular generic ‘off the shelf’ items. So I like to check for any electrolysis with a multimeter.



When the fizzing in my rad is around 0.3V (between ground & fluid) it’s time for a coolant change

Wow collecting percentages of failed English aftermarket radiators for Morgans from the other side of the Atlantic ........ Give that man a hobby

Just to add your only realistic option is to fit another Mulfab radiator given the demise of SiFab a couple of years ago. Ironically the owner Simon previously worked for Mulfab.

A liitle surprised existing Mulfab rad has rotted away, albeit after 13 years. Can't help but wonder what coolant you were using

Some sensible real life comment Rog rather than the BS from a certain quarter!

Yep Rog is spot on there! If you are getting a leak to earth via the fluid the rad will become the sacrificial element or rather a sacrificial element. This is something that became very relevant with the advent of silicone hoses which totally isolated the rad, couple that with a rubber gasket to the top support bar on a Morgan and you have just successfully isolated your rad from ground.

If we are now specifically talking Morgan with an after market alloy rad then using the top or side mount brackets drill a small hole in a suitable place and connect an earth wire with a terminal loop and run the wire to a confirmed earth, as close as you can to the origin of your wire this will provide a better earth solution than the coolant. As Rog also stated the older the coolant gets the more likely that it is to hold a current, couple that with micro metal elements carried in the coolant and disaster awaits the uninformed.
Just change your coolant every two of three years and do a proper flush at five or six years as when you just drain the system passively some of those metal elements will remain in the water ways. Oh! and make sure you use the recommended grade of coolant for your car or a suitably listed improved option. Herein lies another complete subject!