Heater bowl get gunked up with leaves and stuff and leaks behind the heater. Worse case scenario the heater well has rusted underneath and leaking straight through into the cockpit.
Remove the heater and check for rust.....If its there, the only way to fix it is to remove the heater bowl....lots of spot welds....then repair the rust. Dog of a job, but shouldn't take more than a weekend or two if your keen.
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