Chevrolet Trailblazer EXT overheating issue due to radiator leak and thermostat replacement on Chevrolet Trailblazer EXT

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Chevrolet Trailblazer EXT owners report experiencing overheating issues attributed to radiator leaks and thermostat failures. These problems can manifest through signs such as decreased coolant levels, white smoke from the engine, and general overheating, often resulting from coolant leaks in the radiator, water pump, or hoses. Additionally, a malfunctioning thermostat that is stuck closed can exacerbate overheating, especially if accompanied by issues like a blown head gasket. It is vital for owners to address these concerns promptly to avoid further damage and maintain optimal vehicle performance. Regular maintenance, including using the recommended coolant and checking for leaks, is essential to prevent these overheating incidents. If overheating persists despite replacing the thermostat and fixing radiator leaks, further diagnostics may be required to identify the underlying cause.

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