Upgraded software will fix an issue with 2013 Ford Escape and Ford Fusion 1.6-liter models that made the autos subject to engine fires, Ford (F 0.49%) announced today. The engine overheating issue was due to inadequate cooling system software, the company said.

A voluntary Ford recall for almost 90,000 of the vehicles was issued Nov. 30, and the problem did not appear in vehicles with engine sizes differing from 1.6 liters.

The company emphasized in a press release that the overheating occurred only under "unique operating conditions," whereupon the original cooling system "was not able to address a loss of coolant system pressure under certain operating conditions, which could lead to a vehicle fire while the engine was running." Ford says it is rolling out the new software to its dealers now and that owners will be able to get the upgrade starting early next week.

In the meantime, Ford suggests owners of the 2013 1.6-liter Escape and Fusion models contact their dealerships to secure alternative transit options at no charge.

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