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Mack 460 overheating. Need help please


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Suddenly won't go below 215 on gauge even at idle once warmed up. Then overheats and buzzer goes of as soon as it hits a hill or in traffic and have to shut down. Not boiling over at all. Bought 2 new thermometers and water checks at 160. Any ideas. do I need to get something changed or recalibrated? Going to try a new temperature sending unit.

Edited by Daniel Boondocker
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