Toyota to repair 650,000 Prius models globally over coolant risk

Toyota has announced that it will voluntarily repair 650,000 Prius models for a fault in the hybrid cooling system. According to Reuters, a glitch in the vehicle’s coolant pump could cause the vehicle to overheat and lose power, though no accidents or injuries have been reported in association with the problem to date. It’s worth noting that this isn’t an official recall in conjunction with the National Highway Traffic Safety Administration, it’s a service action.

According to the report, the way the electric water pump is designed can allow air bubbles into the system, a development that can slow coolant circulation and increase the heat build-up in Toyota’s Hybrid Synergy Drive components. if the overheating problem isn’t tended to in a timely fashion, it could trigger a warning light and cause the vehicle to slip into limp mode.

The repair notice covers 2004-2007 model year Prius vehicles, 378,000 of which were sold in the U.S.. Toyota will repair the problem free of charge starting in December, and Prius owners can expect to be notified of the campaign shortly. The Japanese automaker is also stressing that it has changed the coolant pump design in the Prius since 2007 and that none of the company’s other hybrid vehicles are affected by the problem.