2012 Toyota Prius started to constantly overheat at about 140,000 miles couldn't figure out what the reason was, we changed The thermostat didn't help, changed the water pump, still didn't help, we checked the coolant fans and the temperature sensors, we decided to test the theory of Toyota Prius's having a problem with air in the coolant system and if you bleed it out, it will fix the overheating problem. It was also causing the heater to not work correctly and heater would not blow very hot, This is part one of three videos on this test, so make sure you watch them all !
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