Hi there,
It sounds like your heater core is leaking and filling up the heater box, the tube you describe sounds like the A/C drain tube, this allows excess moisture from the A/C (the air is dehumidified when A/C is used) to drain away. Get a pressure test done to check the condition of the heater core.
Mark (mhpautos)
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Sunday, December 9th, 2007 AT 8:55 PM