Q: Water under passenger seat and mildew problem

asked by on June 22, 2016

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

My car is overheating and coolant is leaking

This may suggest a blown head gasket. When this happens, the cylinder head gasket fails which can cause coolant to leak into the combustion chamber causing it to be ignited with the fuel. This is what causes the light colored...

2010 dodge avenger saying hotoil where the grears are supposed to be. If you drive it it dissapears and engine light turns on.

If the check engine light is on, then trouble codes have been stored. Even if the light goes off, the codes are still stored in memory and with an appropriate scan tool, the mechanic will read the codes. To get...

Overheating and leaking during driving

BMW had a TSB (technical service bulletin) out for a casting flaw where a leak could develop on the lower right side of the cylinder head. Good news though, that was on the M52TU engines and you have an M54...

How do I install a child restraint system?

Child restraint systems are very important safety features for young children and infants, and can be easily installed in one of the rear seats of your vehicle. Since each child restraint system is different, follow the instructions provided by the...

How do I make my exhaust system sound more powerful? 1998 Dodge Stealth

There are many options on the market today that only a muffler replacement will improve the sound. You can go on some web sites and they will have sounds of the muffler they have for sale to give you an...

Whining noise when accelerate and then let go of pedal

The whining is in the CVT transmission and depending on the noise, it may be a normal noise from the transmission. The noise is the transmission CVT belt changing pitch as you drive faster. Sometime the noise will get...

transmission leakage repair

Transmission fluid leaks were an issue on this model and I see at least two Honda Technical Service Bulletins published on this very issue. Leaks vary in severity and the only way to find out if the leaks on your...

Hi there. I own a 2013 Hyundai i20 and when I drive in the rain, half of the dash lights go off.

Hi there. The wiring could have a ground that is loose or shorting out when driving in the rain. Check all of the ground wires to the vehicle and look for any loose wires or wires that could be contacting...

Oil leak and hissing noise

You will need to check out all of the plastic oil feed lines on the center area of the motor to see if one is broke. This will pump out the oil. Make sure not to let the oil get...

Related articles

How Does Cold Weather Affect Car Hoses?
Cold winter temperatures can cause damage to car engine hoses. Inspect car hoses during the cold months to make sure they're in good shape.
How to Choose and Install Specialty Car Seats
While custom cars commonly see aftermarket additions for performance and overall appearance, only a handful of applications call for the addition of aftermarket seats. In some cases, the seats are replaced with something more comfortable. This is seen in classic...
How to Check Electrolyte Levels in Your Battery
Part Part of what makes a modern battery work so effectively is the ‘wet cell’ design they utilize. In a wet cell battery, there is a mixture of sulfuric acid and distilled water (called electrolyte) that connects all of the...