Car Windows Fog Up: Causes & Fixes
Windows that constantly fog up are annoying and unsafe. A Cranbourne West specialist explains why.
What it usually means
Some fogging in cold, damp weather is normal, but constant or excessive fogging usually means too much moisture inside the car — from a water leak (wet carpets), a blocked air-con drain, a failing cabin/pollen filter, or recirculation being left on. A sweet smell with the fog points to a leaking heater core (coolant).
If you can’t keep the windscreen clear, it’s a safety issue.
What you should do
Get the source of moisture found — especially a leak or heater-core issue — rather than just wiping the glass. A working demister, fresh cabin filter and air-con also help clear it fast.
We trace any leak, check the air-con and cabin filter, and confirm the demister works.
How we find & fix it
Because the same symptom can have several causes, we use dealer-level diagnostics and a methodical check to pinpoint the real cause — rather than throwing parts at it.
You get a clear explanation and a fixed written quote before any work. Book online in 60 seconds or call 03 8782 0711.
Car Windows Fog Up: Causes & Fixes — FAQ
Excess moisture inside — a water leak, blocked air-con drain, tired cabin filter, or recirculation left on. A sweet smell points to a heater-core leak.
It can be — if you can’t keep the windscreen clear. Get the cause fixed.
Air-con on (it dries the air) with the demister and fresh-air (not recirculate) — but fix the moisture source too.
We trace any leak and check the air-con, cabin filter and demister.
Related guides & services
Car doing something odd?
Trusted Cranbourne West car specialists — RACV-accredited, fixed written pricing. Book online or call 03 8782 0711.