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The alternative is that I do indeed have a leak - but where? It's not the thermostat (no coolant in the "V"), not the oil cooler (normal oil levels and no emulsion), not the head gasket (no mayo in the header tank), not the heater matrix (no coolant stains), not the radiator (new last year, no stains), not the water pump (no stains), not the filler cap (new)....
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Maybe check the bottom metal coolant pipes for fine perforation
as these can corrode over time.
PS if I get time today or Friday I will hook up a 2.5 two wire 2 speed fan with gold resistor to my cars loom and force the two speeds on the T4, take a video of it and post it up for you. Arctic