Air Conditioning Evaporator Condensate Drain
If your XM has Air Conditioning and the carpet gets wet in the front footwells, it may be the
condensate drain from the evaporator section. As the evaporator cools the air condensation
forms on the fins and dribbles down into the collection tray at the bottom. A plastic tube
connects on to the outlet pipe as shown and leads the water away out of the car. It is possible
for the tube to become disconnected from the spigot.
You can see the whole heater unit viewed from the offside (RH Drive) here:

Photo1

A/C Evaporator
casing

Heater Matrix slot

Condensate Drain
Point

Front Footwell Vents

Front of car

A/C Condensate Drain

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