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2005 175 Evinrude Running Cold

ajv00303

Regular Contributor
While monitoring my Twin 175's with the EV Software, it appears one is running much cooler than the other.
After allowing both engines to idle for ~10 min on the muffs, 1 stabilizes at ~91* and the other at ~141*.
Any suggestions on how I might find the faulty thermostat?
I know there are 3, I'm leaning towards the lower 1 or the associated pressure valve.
Any input is welcome.
 
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