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.

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Water under passenger seat and mildew problem

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: Heat wasn’t working, Changed thermostat, heat won’t work, temp gauge goes to H.

Hi Eric. Thanks for contacting us today. Typically when you have an issue where the vehicle is running extremely hot and the heater does not work, it's due to an obstruction of debris inside the heater core, or coolant isn't...

Q: Vibration in front with loud humming sound

Hello, A wheel bearing will usually fail due to pitting or small damage on the surface of the rollers or the bearing race. Both the surface of the rollers and the race is precision machined to tight tolerances and highly...

Q: Q: Car overheating and leaking

It sounds like you have a coolant leak. The most common coolant leak I've seen on your vehicle make and model is the intake manifold. The intake manifold is made of plastic and cannot withstand high temperatures like metals can....

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.