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Reply to "Cooling - What’s this small hose?"

On my early car (s/n 1744) the small hose on the radiator goes to a fitting on the main radiator connection hose.  It has a small 'T' connection which I have always assumed was for bleeding / filling purposes.  The main pressure tank on my car had a temperature sensor in the middle port - doing what god knows.  I have since plugged that and chucked the sensor.

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