Car Windows Fogging Inside in UAE (2026) — Causes and Fixes
Windshield fogging from the inside of the car is a complaint from UAE drivers particularly in the cooler winter months of November through February, and also year-round in vehicles with a leaking heater core or water ingress. Unlike exterior condensation which clears in minutes, interior fogging is caused by moisture trapped inside the car cabin itself and requires specific steps to resolve.
Causes of Interior Window Fogging in UAE
A leaking heater core is one of the most serious causes. The heater core circulates hot engine coolant through a small radiator inside the dashboard. When the core develops a leak, coolant vapour enters the cabin through the HVAC vents, producing a persistent film on the windshield that often feels slightly oily and has a sweet smell. This is a repair requiring heater core replacement. Sunroof or weatherstrip water leaks allow moisture to enter the cabin and evaporate onto glass. A wet headliner or wet carpet from a blocked sunroof drain or failed door seal contributes significantly to interior humidity. UAE cars parked outdoors overnight accumulate humidity from the warm coastal night air. Wet interior from car washing or rain entry through open windows is a temporary cause that resolves as the interior dries.