Thousands of owners of Vauxhall's Zafira models been urged to take their cars for inspection after more than 130 were reported to have burst into flames.
The problem, the cause of which is being investigated by the manufacturer, affects some vehicles made between 2005 and 2014.
Around 225,000 such vehicles were sold in the UK. Though the car firm has admitted it has "no idea" how many of these are affected by the issue, is not yet issuing a full recall.
Sue Freemantle and Claire Wheatley from Plymouth were among those to see their Zafiras catch fire.
Footage obtained by ITV Westcountry shows firefighters attending Freemantle's blazing car, minutes after she, her cousin and their four young children had been sat in it.
They have now set up a Facebook page for others affected by the fault to come forward.
Zafira drivers offered free inspection
- Anyone with a Vauxhall Zafira model built between 2005 and 2014 is invited to arrange a free inspection with their local Vauxhall dealership
- Vauxhall will replace the resistor free of charge in every vehicle
The company has since admitted some affected cars have caught fire "without advance warning".
Early investigations suggest a potential fault with the heating fan, pollen filter and resistor in cars repaired using a "non-Vauxhall approved" component.
The company says it will replace the resistor in each vehicle for free, as it attempts to check whether the non-Vauxhall, "copycat" part could be to blame.
Full recall 'when we find a cause'
Vauxhall's director of communications Denis Hick said there will be a full recall "when we get a root cause", adding that the resistor check is "just one line of inquiry at the moment".
Until then urged concerned owners to book an appointment at their local dealership for a free inspection.
Video report by ITV News Correspondent Damon Green