temperature guage erratic
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Freshman User
Joined: Dec 2003
Posts: 34
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From: longview,texas
temperature guage erratic
82 f100 4.9 inline 6, automatic. Before having engine rebuilt, the temperature guage would rise to where it looked like it my become hot and then the guage would fall back to normal. Then it would happen again. I did have the engine rebuilt and they found that the head at a crack in it. I don't know if this caused the erratic behavior or not. On the left side of my engine in the block toward bottom there looks like to me a sensor of some kind screwed into the block but there was no wire connected. What reads the engine temperature to send to the guage in truck ?
Lead Driver
Joined: Jun 2006
Posts: 5,635
Likes: 963
From: Near Yosemite CA
That would be the temperature sending unit, they do go bad, if the wire was broken off, it could rub on block, cause gauge to move around, I would get new sending unit, and trace the wire back and make sure you have one hooked up to it. Also bad engine ground, or instrument cluster regulator can cause problems, however, intstr clstr regulator usually has ALL the gauges acting funky.
