VAUXHALL has recalled 47,000 more Zafira Bs over fears they can explode into fireballs.
The car giant says all models with Electronic Climate Control (ECC) are at risk and should be fixed.
It previously refused to recall the ECC models despite Sun engineers repeated warnings in 2016.
This represents an embarrassing u-turn and another example of the firm failing to act quickly to protect families.
Sun experts previously bought an Zafira B which was then dismantled for rigorous laboratory testing. They also examined cars that suffered blazes.
The resulting report read: “The same root cause of moisture ingress and heater blower motor corrosion applied to the Zafira B also applies to the ECC model.
“Case studies and an examined fire damaged ECC vehicle strongly suggest that these vehicles are exposed to a risk of fire in the heater system which has not been replicated in controlled test environments.
“I recommend that Vauxhall incorporates ECC-equipped vehicles in the Zafira B recall 16-C-50.”
Vauxhall is facing a criminal investigation over Zafira fires that resulted in 161 model Bs catching light.
MPs previously said the manufacturer showed “reckless disregard for safety” by being too slow to react.
In 2016, The Sun revealed a design flaw in the Zafiras was to blame for fires – forcing the firm to recall 230,000 vehicles.
A Vauxhall spokesman said: “We are launching a recall of some Vauxhall Zafira models to replace the heater blower motor and regulator.
“These are the Zafira B models, built between 2005 and 2014, fitted with electronic climate control. There are 47,000 such cars in the UK.
“We will write to owners using the keeper address data from the DVLA advising them to contact a Vauxhall Retailer to arrange to have the work carried out free of charge.
“Letters will start to be sent out from the end of this week.”