Mitsubishi Outlander radiator overheating issue with no leaks detected on Mitsubishi Outlander

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

Problem overview

Some Mitsubishi Outlander owners report experiencing radiator overheating issues despite having no visible leaks. These problems may stem from a malfunctioning radiator fan that fails to cool the radiator adequately, necessitating inspection and possible replacement. Additionally, a failed thermostat can disrupt coolant flow, leading to engine overheating, so checking and replacing it may be essential. Some owners have found that a clogged radiator hinders proper heat dissipation, which can be resolved through flushing or professional cleaning. Furthermore, inadequate coolant levels or poor-quality coolant can contribute to overheating, highlighting the importance of regular checks and replacements as per the owner's manual. A broken or loose radiator cap may also lead to coolant leaks, prompting the need for inspection and replacement. Lastly, conducting a radiator pressure test can help detect hidden leaks that could be causing the overheating issue. Addressing these potential causes is crucial for effective troubleshooting and preventing further vehicle damage.

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