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Reply to "About a cable and tanks..."

quote:
My pressure tank has a 4th connection for a sensor

That was the original location of the temp gauge sensor.

It was not a good place. If the water level should ever drop below that point, easy to happen with a leak, the sensor would only be measuring air temp, not coolant.

BIG trouble would no doubt follow, as the gauge shows nothing wrong. But the motor is fast on a suicide journey.

Most owners have long ago moved the sensor to the proper place in the block, below the thermostat housing.

Larry
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