Climate control, bodywork and interiorUrgency: Garage soon

Windscreen will not demist or takes a long time to clear: causes and the faults that trigger it

3 documented faults cause it in 3 cars:

High severity: Foam in the windscreen demister nozzle limiting visibility (2026 recall F61L) · Fiat Grande Panda
Low severity: Windows that mist up easily on the Active Tourer · BMW Serie 2 Active Tourer F45
Low severity: Heater blower resistor failure · Rover 45

What it means

The windscreen mists up on the inside and demisting takes too long or never fully clears the glass, which reduces visibility. It may be caused by a clogged cabin filter, an air conditioning system that does not dehumidify, blocked air vents or a manufacturing defect corrected through a campaign.

General explanation from MotorFiable. How it shows up in each engine, with sources, is in the list of faults.

What to do now

Garage soon

If you cannot clear the windscreen with the ventilation at full power, do not drive with poor visibility and ask for the ventilation and the cabin filter to be checked; also check with the VIN whether your car has an outstanding campaign.

Reviewed on 29 October 20264 sources How we work

Faults that cause it

Suspension, brake, electronics and other faults on specific cars, from most to least important.

- High severityFrequency: OccasionalFiat Grande PandaFoam in the windscreen demister nozzle limiting visibility (2026 recall F61L)The source describes no warning symptom, but the effect of the defect is insufficient windscreen demisting, with reduced visibility.
Source for the symptom in the Fiat Grande Panda^[1]
- Low severityFrequency: OccasionalBMW Serie 2 Active Tourer F45Windows that mist up easily on the Active TourerInterior windows that mist up quickly in damp conditions.
Source for the symptom in the BMW Serie 2 Active Tourer F45^[2][3]
- Low severityFrequency: OccasionalRover 45Heater blower resistor failureThe heater fan does not work at some speeds, which makes it harder to demist the glass.
Source for the symptom in the Rover 45^[4]

Other symptoms: climate control, bodywork and interior

All symptoms

Has this happened to you? Tell us which fault it was, at how many kilometres and how much you paid: it helps other owners know what to expect. Report your fault.

Sources

Every fact on this page links to its source. If you find an error, let us know.

Fiat Grande Panda: Windshield Defrosting Issuecar-recalls.eu · Other source · published 29 June 2026 · consulted 5 October 2026
BMW 2er Active Tourer (F45): Schwachstellen und ProblemeGebrauchtwagenberater.de · Motoring press · consulted 27 September 2026 · in German
BMW 2er Active Tourer: Probleme, Schwachstellen & RückrufeCarWiki.de · Motoring press · consulted 29 October 2026 · in German
Rover 45 hatchback (1999-2005) review and buying guideClassic Car Reviews · Motoring press · published 19 September 2026 · consulted 29 October 2026