Whilst running my engine to test the speedo all the air in the header tank 'disappeared'.
After some head scratching I realised the air had not leaked out but it had all accumulated in the top of the radiator.
I then realised I had made a school boy error when I moved the header tank vent hose from the top of the radiator connection to the cooling fan-switch adaptor in the top radiator hose. I had overlooked the fact that the adapter was set in a hose that was about 4" lower than the top of the radiator.
I've now re-configured the top hose so that the fan switch adapter is now level with the top of the radiator so there should be no chance of air being trapped in the top of the radiator. It's a bit of a Heath Robinson design and I hope to create something more elegant one day.
First test went well but only time will tell if it is okay.
Cooling system - Mk 3 by
Sabrebuilder, on Flickr
I have been lining the boot and finishing off a list of small items before the IVA test.
....peter