There’s coolant in the heater core at all times. Also I’ve seen plenty of heater core leaks that aren’t severe enough to leak onto the floor, yet will still fog the inside of the windshield.First off, the heater core wouldn’t have water running through it in the AC mode. Secondly, if the heater core is leaking you will have a puddle either in the footwell on the passenger side or on the ground under the vehicle.
But either way, until it’s properly diagnosed I agree that it doesn’t necessarily mean there is a heater core leak.
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