Erratic Temperature Reading (2006 E-450) - Ford Powerstroke Diesel Forum
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Old 03-30-2013, 01:02 PM
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Erratic Temperature Reading (2006 E-450)

New guy could use some help on this. Haven't taken it to a shop yet and would rather not if I can avoid it.

Yesterday I was driving it and the temperature got just above mid-range on the temp gauge. The "check gauges" light came on and then within 30 seconds it had cooled back down and the light went off.

Today my crew was driving it. They said the temperature was going up and down erratically but never past the operating range on the gauge. The "check gauges" light never came on.

Is this normal for an E-450? We've only have the truck for a month so I'm not very familiar with the truck yet. I just changed the oil and filter with Rotella 15w 40 earlier this week. Doesn't appear to be leaking any coolant.

Any help would be greatly appreciated.
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Old 03-30-2013, 05:08 PM
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You need a monitor, read up on the monitoring stickies. That guage on the dash is useless. Without a monitor, we're just guessing. A monitor can also pull stored codes.

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Old 03-30-2013, 05:50 PM
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you definitely need a monitor. A code like fan clutch signal missing wouldn't set a check engine light and could definitely be the cause.
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Old 03-30-2013, 09:57 PM
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Thanks for the replies guys. I'll try to get a monitor asap. I guess I'll have to let a shop look at it in the mean time.
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Old 03-30-2013, 10:19 PM
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The gauge only works while it is under water-coolant, if you are low on coolant it can cause what you are seeing, check the coolant level.
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