what causes a cracked radiator
Answers.comÂ® is making the world better one answer at a time. A plastic radiator will crack under extreme over heat conditions for example a defective thermostat or bad cylinder head gasket will cause a cooling system to over pressurise and rupture. 4 people found this useful.
Coolant puddle: One sign of a cracked radiator is leaking coolant. The coolant fluid is red or green in color, so if you see a puddle of this under your vehicle, contact a mechanic as soon as possible. The coolant is toxic to both humans and animals so be careful if you have small kids or pets.