Engine Cooling problem
2006 Kia Spectra 4 cyl Two Wheel Drive Automatic 69000 miles
Car began overheating the same day I took it in for 60,000 mile maintainance. Dealership said they pressure tested for leaks but didn't find any. Said the coolant was low was why it overheated. System was flushed as part of maintainance. Service tech said at that time it was low because my reserve tank wasn't being refilled when I had my oil changes done? 6000 miles later, started overheating again. Took back to dealership, they pressure tested again, still no leaks found. This time they said the coolant was low because they think there was a 'bubble' in the system when they replaced the coolant during the 60,000 maintainance. Is this plausible? I'm waiting to see if this happens again in another 6000 miles.