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Coolant sensor wire should have 5v, im getting 3.6v. Truck shows check emgine for low coolant.. Any ideas?

Did you ohm the sensor to see if it was within range?

there are lots of other posts of the past about low coolant alarms on trucks when the coolant level is fine.. it is a common issue. Here are some other threads.. maybe take a read thru some of them...

http://rawze.com/forums/showthread.php?t...7#pid39667

http://rawze.com/forums/showthread.php?t...9#pid26429

http://rawze.com/forums/showthread.php?t...8#pid29328

http://rawze.com/forums/showthread.php?t...0#pid25580

i am sure there are more of them.

Any body know of an issue with the coolant level sensor Freightliner uses causing issue or not working well with OAT coolants?