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Hey guys, i have a 2011 Subaru WRX sedan and it keeps overheating whenever it rains, anyone have any idea what it could be? I noticed that the lower rad hose where the thermostat is, stays closed when it does overheat, which makes sense, but i still dont know why it only happens when it rains. Ive already replaced the thermostat and flushed my coolant, the problem is still there, any help would be great.
 

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Wet the temperature sensor and all exposed wiring to/from it while the engine is running and see if you can replicate the problem.
 
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