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  1. J

    Td4 Thermostat Replacement - The Way To Do It!

    From my days in the BMC Service School (talking 70s here) the number on the 'stat was the 'crack open' temperature, ie. the point at which the 'stat just starts to open. The approved testing method was to push the valve open against its spring enough to insert the end of a length of thread...
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