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Experts are divided about whether the fires are being caused by a combination of electrical faults and a plastic fuel line, or by problems with the vehicles' cooling systems.
Ford has urged owners of affected models to bring their vehicles for the replacement of coolant containers and water hoses, arguing that cracks in the containers cause vehicles to overheat and catch fire.
"While our investigations into the incidents are not complete , we have found that the fires may be a result of engines overheating," said Gardiner.
He said Kuga 1.6l owners had been advised to contact their Ford dealer to "check the coolant concentration level, and for any leaks or damage to the cooling system".
Gardiner said all vehicles sold in South Africa were compliant with the national legislation.