High coolant temp - according to AutoEnginuity - Ford Powerstroke Diesel Forum
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Old 04-12-2011, 05:41 PM
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High coolant temp - according to AutoEnginuity

I haven't used my truck for a while, but I have been using my AutoEnginuity scanner on my van for other problems so I'm learning a little with each scan. Anyway, tonight I decide to start my truck and scan it. I happened to check the coolant temperature with the scanner and was surprised to see it at over 250! The truck hadn't been running for more than 5 minutes so it was still cold (it's only 50 here outside). The temp gauge still hadn't moved but according to AutoEnginuity, the temp just kept climbing - I shut the truck off at 280 - that's after not more than 10 minutes of idling from stone cold. I find it difficult to believe that the coolant was really that hot. Maybe a sensor went bad?

So, I wondering - does the PCM get its information from a different sensor than the temperature gauge? I'm thinking it must because if I recall correctly, my temp gauge does work - it just never had a chance to get warm enough to register tonight. I did some searching here but haven't been able find anything yet. I'm hoping someone can help.
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