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I,ve had a problem with the " Snail " for a while now, just would not hold temperature properly and was using water , not at an alarming rate just a little concerning , it culminated in an overheat that nearly blew the headgasket , the poor car was stranded in the driveway till an answer was found , when my Great - Uncle passed away I got quite a lot of old and very useful tools and bits and pieces , one item was a Warren & Brown Cooling System Analyser , all original still in its box , the first part of testing is attach the radiator cap and pump it to the rated pressure of the cap , well my cap would,nt even fit let alone hold any air to test it , problem found , quick trip to Autobarn , the right cap was on the shelf , fitted new cap , started the car , once it ran up to temperature it pushed a little out the overflow and was all back to normal , even after 10 minutes running I could put my hand on the cap , I gave the " Snail " a good 1 hour run today, a few hills and some twisty stuff to blow out the cobwebs and there was no problems.
I,m using 20% rust inhibitor , 20% coolant , 60 % water, normally being Winter I would have had the Grill Muff on but it was a clear fine afternoon , no chance of the carb freezing
so to all those people hell bent on an alloy radiator and a thermo fan to keep it " cool " test your radiator cap first
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even with the 88 degree thermostat 
. And yes the guage reads correctly.
