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Discussion Starter · #1 ·
Is it normal for my coolant temp to be running at 250 degrees, while just idling and just started.
 

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Where are you getting that number? If it's from a OBD2 port linked gauge, then know that unless you have a manual transmission, that's a fictitious number. The PCM doesn't monitor coolant temp. Switch to watching engine oil temp. That one is real.

If you have a gauge and you're seeing actual 250 degrees, then you've got a major problem.


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Discussion Starter · #3 ·
Where are you getting that number? If it's from a OBD2 port linked gauge, then know that unless you have a manual transmission, that's a fictitious number. The PCM doesn't monitor coolant temp. Switch to watching engine oil temp. That one is real.

If you have a gauge and you're seeing actual 250 degrees, then you've got a major problem.


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Yes, I am reading it from a SCT Livewire. Why wouldn't that number be real?? It
 

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It isn't real because there is no physical connection between the coolant temperature switch (it's not even a true sender) and the PCM. The number you are seeing is some generated aberration. The coolant temperature switch only connects to the gauge on the cluster.


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Who knows what its measuring. It basically generates that number
 

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Yeah, I've had AE tell me that my coolant temp was way below ambient temp. Like that could happen. I learned early on to ignore it.
 

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What is it measuring then?
It's doing a quick pick for tonight's lottery drawing.:grin2:

On a more serious note, I've seen some scanners/apps display their own max preset gauge parameter, when no real value is present in PCM. Hence a steady 250, even on start up.
 

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:grin2: I know nothing! Not a 6 speed.
 
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