Chevrolet Volt owners have reported 2 problems related to radiator (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Chevrolet Volt based on all problems reported for the Volt.
I live in and drive my car around southern California under normal conditions. My battery coolant radiator was hit by a small rock and leaked. This prevented charging, caused a check engine light to come on, and coolant to pool underneath my car. I towed it to a nearby chevy dealership to get the radiator replaced. Radiator damage to Volts is not uncommon. Chevrolet knows this is an issue and has issued a service bulletin covering some (but not all) Volts due to their low, vulnerable, and relatively unprotected design of the radiator. I believe Chevrolet should remedy the problem with stronger radiator shields and protectors.
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Radiator failure/leaking at 67000 miles. Unknown cause. Caused car to overheat and had to be shut down to avoid further damage to electrical/battery components. Cost to repair exceeds $1500.