Q: Does blocking heater horses causes overheating?

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I realized that water was leaking somewhere under the dash on the passenger mats so I assumed it was coming from the heater horses and it was causing the temperature to rise on the dash.I opened the bonnet and blocked the horses then it stopped but now the water is not circulating and the car is overheating.Does blocking water from circulating on the heater horses causes overheating on the engine?

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