• A coolant leak
• A faulty thermostat
• A problem with the water pump
• A blown head gasket
• Low coolant levels
If the red temp light flashes, it is important to pull over and turn off the engine immediately. Allow the engine to cool down, then check the coolant level. If the coolant level is low, add more coolant and try to start the engine again. If the red temp light still flashes, it is important to have the car towed to a mechanic for further diagnosis and repair.
Continuing to drive with the red temp light flashing can cause serious damage to the engine.