Question about 2001 Volkswagen Passat

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2003 passat sedan. water on floor and in heater fan

I have a 2003 passat sedan. after a night of heavy rain there was water on the drivers side floor and you could hear the heater fan spinning in water. after about 20 min of driving w/ heat and ac on the fan in water noise stopped. i have heard thsi before but never had water in the car. it has a sunroof but i don't think the drain tubes are plugged because the roof pillars are not wet-thsi has happend before.

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  • estuder Jun 09, 2009

    all drian holes in heat/ac system were blocked. opened all holes and got a gallon plus of water out of it. it may be leaking but do not have cash to repair replace. will keep drian holes open. worked last night. rained like crazy again all night-no water in car.

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I don't think it has anything to do with the sunroof. I think you have a leak either around the windshield or under the cowl where the wipers are attached. If it's in the cowl area probably over the blower motor housing on the right and the water is following the vent system to the drivers side. Please let me know how you made out.

Thank you

Posted on Jun 04, 2009

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Wet floor under drivers feet


A wet floor indicates one of two things; either rain water or coolant.

Press a paper towel into the wet spot on the floor / carpet. If colorless, it is likely rain water that has entered through an open window, an opening in the sealant between the windshield and the body opening for it or an opening in a seal between panels of the firewall.

If there is a green, pink or yellow tinted color, it is probably coolant. If it feels slippery between your fingers and has a "sweet" smell to it that further suggests that it is coolant. A check for lowered coolant level in the radiator / empty reservoir can all but seal the diagnosis.

The leaking rain water can be tough to find if the source is not immediately and plainly visible. If it is a coolant leak - it is probably coming from the heater core - as it is the only place coolant enters the cabin. The leak in the heater core *may* be able to be stopped by adding some of those "radiator stop leak" additives directly to a cold radiator. More often then not - the heater core will need to be replaced. The cost of this job can vary significantly based on the amount of labor required to gain access to the heater core itself (often it is buried up and behind the dashboard - requiring a large portion of it to be removed).

Below is the process for a 2003 Passat.

This is nearly always a job for a trusted mechanic. Good luck!

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