INFINITI FX35 overheating issue possibly caused by thermostat sticking after radiator leak sealant application on INFINITI FX35

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

Problem overview

Some INFINITI FX35 owners report experiencing overheating issues potentially linked to a sticking thermostat after applying radiator leak sealant. These overheating problems can stem from various factors, including coolant leaks, radiator fan malfunctions, and failed thermostats. Common causes of coolant leaks in the FX35 include issues with the water pump, radiator, and hoses. While radiator leak sealant may provide a temporary fix, it can lead to thermostat complications, such as sticking, which disrupts the engine's cooling system. Owners are advised to address thermostat issues promptly, as neglecting them can exacerbate overheating concerns. Additionally, using the recommended coolant and ensuring the proper functioning of radiator and reservoir caps are crucial maintenance practices to prevent overheating in the INFINITI FX35.

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