Monday 19th October 2015
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Now that the nights are drawing in, it’s getting darker earlier and colder and frost is appearing so many of us are waking up to cars riddled with condensation.   When moisture meets a cold windscreen it alters invisible vapor into water droplets and this sticks to the inside of glass. Freezing air from outside the car meets the slightly warmer air in the car to create condensation. Rather than stand in the freezing cold as you demist the windows what else can you do to reduce condensation in cars on chilly mornings? In this blog we reveal the causes and fixes for condensation.

car condensation

Causes of condensation

All cars get condensation but occasionally it might be quite bad because something is wrong with the car.  You will need to check to see where the source of leaks might be.   Check if rainwater is coming in via the pollen filter possibly because the waterproof cover isn't put in properly.  Doors without damp proof membranes and failed door edge seals often cause leaks.  Ineffective failed front or rear screen seals and dodgy rear lamp cluster seals can also be culprits.  Blocked bulkhead vents leave rain no where to escape to but into the vehicle.  Failed metal to metal joints during the production of the car can sometimes be to blame.  Missing bolts, pipes coming off the rear washer jet, failed sunroof seals and ineffective air conditioner condenser can also contribute to major condensation issues.  Your mechanic should be able to help out here as they tend to know the weak areas of certain makes and models where water tends to be let in.  Sometimes these fixes can be costly and the source of the leak is often hard to identify.

Some quick fixes to reduce condensation:

  • Clean windows thoroughly on the inside and outside using newspaper or a clean microfiber cloth.  Build up of debris can increase dampness so keep the vehicle clean.
  • Always remove damp items such as jackets, umbrellas and mats.
  • One popular remedy is to put cat litter in a pair of old tights or socks and leaving it in the car.
  • Some retailers like Lakeland offer specific dehumidifying products like the Moisture Magnet.
  • Whenever possible leave windows open to improve air flow but keep valuables out of view.
  • Switch on the heater blower and direct it at the windscreen.  Ventiliation should be at maximum while the temperature control should be at minimum.
  • Air conditioning will be faster and more effective.

Sometimes condensation can affect headlights as moisture builds up inside and reduces the effectiveness of the headlights.  Usually this is caused by a small crack but a good mechanic can identify and resolve the problem.   If condensation proves to be a real problem even when you’ve tried some of the fixes we’ve suggested then talk to your mechanic in case there are leaks or something else more serious going on.

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