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Heater core isolation

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  • Heater core isolation

    On my 63 Morris Cooper S I have an "upgraded" heater labeled British Leyland,
    so newer than the car. it has the proper heater cable operated valve on block.
    However, when I shut off the valve ( I freed up the cable and valve connections) I still get heat through the core. I would like to shut the core off in the warmer months (car runs cool enough I think) and wonder if a small brass shutoff valve in the return hose would make that happen and if there is a downside to that (or other ways to do this). Any suggestions would be appreciated.