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If your heater core hose leaks, you would know simply by looking at it, approx. 3/4in dia hosing is most common. usually running from water pump outlet, to heater core, back to water pump inlet. when a hose breaks/bursts/cracks or any of these similar type scenarios the pressure from the line's (at normal operating temp) would cause it to swell and welt, easier said it would be easier to find a heater core hose leak while the car was running at around 190 degrees, aka normal operating temperature. also check your radiator, coolant reservoir, upper and lower radiator hoses, and heater core itself. any of those can cause leaks, NEVER USE RADIATOR STOP LEAK !! it does more harm than good in the long run and only prolongs the inevitable,

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Q: How do you find where my heater core hose leaks?
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