Persistent damp in the car is more than a mere nuisance. If it smells musty, the windows are constantly fogged up on the inside and the mats are soaked, this can be a serious warning sign. This guide will help you easily remove damp from your car.
Extra condensation and damp in the car interior
![]() |
![]() |
Further symptoms are: fogged up and sometimes even iced interior windows, mould in the interior, damp seats.
What causes damp in the car interior?
Damp can happen with regular use. Snow remaining on the shoes is the most common cause of damp in the car interior. This should pose no problem and becomes apparent during driving. The air conditioning of the car is an adequate de-humidifier and can be used to this end in winter as well. However, if there is a consistent damp problem in the car, this deserves extra attention.
A damp interior can develop in many ways. They all have in common that unwanted water enters the car. Water in a car is not necessarily just water. Therefore, the first measure is to determine where the moisture penetrates. Water can reach the interior in three ways:
1. Rainwater:![]() |
2. Water splashing against the base of the car:![]() |
3. Water from the interior heating![]() |
Switch on the heating and put the interior blower on windshield ventilation. If it condensates right at the nozzle, the heat exchanger is probably defective. If the car floor is already wet, take a white moist-absorbing cloth. Toilet paper, kitchen paper or paper handkerchiefs are most suitable for this. Absorb a bit of moisture in the cloth or paper and check its colour. If it is clear, it is probably splashing water from below the car. If it is the coolant’s colour, you have found the cause.
Tip: a heat exchanger is a very cheap spare part. Depending on car it costs between £13 and £45. Its installation is rather complicated. In most cases, the entire dashboard with steering wheel and airbag must be disassembled. Technically it is not too difficult; however a layman may want to plan an entire weekend for this.
Removing damp from your car
If you have determined the cause, your car is now protected against further penetration of unwanted water. Now you need to remove the present moisture to make the car fully comfortable again.
Work thoroughly to prevent smell and mould to settle in the interior.
How to get rid of damp in the car |
1. Checking the textile
|
2. Removing extra damp from your car
|
The remaining damp in the car can be removed with help of a desiccant; those with silica gel are very suitable. In a three-piece set these cost £11 – £13. If you prefer a cheaper method, use salt or charcoal. Take an empty biscuit tin and perforate its lid with a spike tool. The more holes, the better it works. Fill the tin with charcoal. Please ensure that you only use pieces which are bigger than the holes. Tape the tin shut with tape and put it under the passenger seat. The dry charcoal will now gradually absorb all moisture from the interior. Instead of charcoal and a tin, you can try old socks filled with salt or cat litter.
Tips for quick readers:
– Put newspapers on the foot space in autumn and winter
– Make your own interior dryers with charcoal, cat litter or salt
– Immediately repair a defective heat exchanger
– Check drainage pipes on clogging
– Replace rotting foot mats or carpet
Foto: nikhg, 290712, FotoDuets, Kzenon, FotoDuets, Photographee.eu, photosthai, Alexey Ryazanov, Monika Wisniewska/ shutterstock.com