Skip the auto shop - Our mechanics make house calls

Q: Water under passenger seat and mildew problem

asked by on

While driving in the rain one day, with the A/C on, I noticed a lot of cold water under the passenger seat. Under each seat in my car, there is a very flat hose, which I assume is to vent air to the back seat passengers. I thought that the water condensed and leaked out under the passenger seat, but the dealership is totally stumped! They’ve checked everything that seems relevant, including the evaporator coil, but that’s not it. They couldn’t duplicate the problem. They could not find a way to help me and now I have to live with Mildew in my car! Please tell me what to do and how to find help for this problem. Thanks.

A: If the A/C evaporator drain is clogged or p...

If the A/C evaporator drain is clogged or partly clogged, then the water condensation from the normal A/C operation cannot drain out of the evaporator case and has to go somewhere. The place it usually goes is out of is the floor vents. Have the A/C evaporator drain checked and cleaned out. Try to not park under trees that shed the leaves and seeds in the future. This is what clogs the drain. As for the mildew, there are several methods listed in this article for maintaining car upholstery after liquid damage.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do I extend the passenger-side sun visor?

The passenger-side sun visor can extend towards the middle of your vehicle to offer further protection from the sunlight. To slide your visor towards the middle, follow these three easy steps. Unfold the visor so that it is fully...

Q: Warning lights and PO344 Camshaft Position Sensor

This vehicle came with three different engines and they all have different directions to replace the sensors. The sensors also may have specialized removal and installation procedures that require special tools for the seals and sensors. The code P0344 is...

Q: I had a bad oil leak and now I hear a spark sound. Do I need a new coil?

If the oil leak has made its way to any spark plug wires or coils and the wires or coils show signs of swelling or cracking then the component must be replaced especially if spark is coming out. The oil...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.