Engine Cooling problem
2002 Mazda 626 6 cyl Front Wheel Drive Automatic 99300 miles
My husband asked me to put coolant in the almost empty resivoir in my 2002 Mazda 626 before taking a 200 mile road trip. I purchased a fairly high end coolant and added it. At some point before leaving to return home the check engine light came on. That night on the return trip the car overheated very suddenlly and rapidly so we pulled to the side of the road. We let it cool for quite a while and turned it back on but it heated back up immediately. We then had it towed the remaining 60 miles to our house. Is it likely that this is the water pump?