Another EOT and ECT
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Another EOT and ECT
Hi Guys,
I have a STOCK 2007 F250 with an upgraded EOC and was climbing a steep hill for a while and my EOT increased to no more than 218 (normal for me is 198 with a variance of 7 degrees to the ECT) but it created a variance of greater than 15 degrees to the ECT. As soon as i stopped climbing the temperature went down.
I have read that a 15 degree variance can blow the HG. I was concerned when the temp had a variance greater than 15 by 3 degrees.
Is this normal? At what temp does the fan kick on? Can i safely run a variance greater than 15 if hill climbing and for how long? At what temp should i stop the truck and let it cool down?
I am a newbie so any info will help.
Thanks!!
I have a STOCK 2007 F250 with an upgraded EOC and was climbing a steep hill for a while and my EOT increased to no more than 218 (normal for me is 198 with a variance of 7 degrees to the ECT) but it created a variance of greater than 15 degrees to the ECT. As soon as i stopped climbing the temperature went down.
I have read that a 15 degree variance can blow the HG. I was concerned when the temp had a variance greater than 15 by 3 degrees.
Is this normal? At what temp does the fan kick on? Can i safely run a variance greater than 15 if hill climbing and for how long? At what temp should i stop the truck and let it cool down?
I am a newbie so any info will help.
Thanks!!
Posting Guru
Joined: Dec 2012
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From: SW Florida
The 15* variance only applies when you are up to operating temperature (roughly 190*) and traveling unloaded at a steady 65 mph on a FLAT highway for about 20 minutes.
It does not apply to.....climbing hills, descending hills, towing, or loaded down with extra weight.
Also, a greater than 15* variance does not mean a blown head gasket is soon to happen.
Several factors determine when the fan ramps up....engine coolant temp, trans temp, and I think 2-3 other things. As a rule, the fan should ramp up somewhere between 210 - 220 ECT depending on the info the computer sees from those sensors.
It does not apply to.....climbing hills, descending hills, towing, or loaded down with extra weight.
Also, a greater than 15* variance does not mean a blown head gasket is soon to happen.
Several factors determine when the fan ramps up....engine coolant temp, trans temp, and I think 2-3 other things. As a rule, the fan should ramp up somewhere between 210 - 220 ECT depending on the info the computer sees from those sensors.
Posting Guru
Joined: Nov 2012
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As stated many factors go into when and for how long the clutch fan engaes and runs.
Also base parremeters are set from 65mph on flat ground with no load for 30 minutes or so.
Basicly your temps under stated conditions are not abnormal.
Also base parremeters are set from 65mph on flat ground with no load for 30 minutes or so.
Basicly your temps under stated conditions are not abnormal.
Posting Guru
Joined: Jun 2012
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I've seen temperature differences of zero and 20 degrees - within minutes of each other. Cresting a big hill while towing coolant pops up to 220, oil is at 220, and halfway down the hill on the other side coolant is dropping fast to 195 while oil temp slowly comes down. Completely normal.
BTW, temperature differences have nothing to do with blowing head gaskets as a cause and effect. Temperature differences over 15 to 20 degrees under a set of test conditions are a symptom of a clogged oil cooler. A clogged oil cooler can cause the EGR cooler to fail. It's that failure than can cause head gasket failure. So no need to worry if your temperature difference spikes for a few minutes, it won't cause any harm. It's long term ignoring a clogged oil cooler that causes issues. Also your 2007 has a Wrench light that will come on if the computer decides the difference is too great, and it has a far more sophisticated algorithm than just 15 degrees...
Brian
BTW, temperature differences have nothing to do with blowing head gaskets as a cause and effect. Temperature differences over 15 to 20 degrees under a set of test conditions are a symptom of a clogged oil cooler. A clogged oil cooler can cause the EGR cooler to fail. It's that failure than can cause head gasket failure. So no need to worry if your temperature difference spikes for a few minutes, it won't cause any harm. It's long term ignoring a clogged oil cooler that causes issues. Also your 2007 has a Wrench light that will come on if the computer decides the difference is too great, and it has a far more sophisticated algorithm than just 15 degrees...
Brian
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