ECT/EOT Temps - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 06-29-2012, 09:29 PM Thread Starter
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ECT/EOT Temps

Quick Background-2004 6.0. Std. Transmission. Truck weighs approx. 13,000 lbs with the service body. Have an edge insight CTS, but otherwise bone stock.

After I replaced my stuck thermostat last year my ECT was about 190*, EOT was ~200*. Lately I have been noticing that my EOT has been creeping upwards of 210*...up to as much as 215*. ECT has also been creeping up, to about 197*. As part of my PPM I replaced the radiator last week, now engine temps are staying around 190*. Temps stay down on slow driving, but on 20-30 minute trips at highway speeds (55 mph + ) the delta starts to climb.

Still running stock Ford Coolant, no coolant filter. Oil cooler was changed under warranty according to the oasis report about 80K (I am second owner). I cleaned the EGR about 5K ago, didn't notice any moisture in the manifold.

Is it too late to flush and go to ELC with a coolant filter, or did I screw up and let the oil cooler get plugged again? We have been having really hot temps here in Tx the last few weeks (95*+ ambient) if it makes a difference.
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post #2 of 8 Old 06-30-2012, 05:06 AM
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Is it too late to flush and go to ELC with a coolant filter, or did I screw up and let the oil cooler get plugged again? We have been having really hot temps here in Tx the last few weeks (95*+ ambient) if it makes a difference



Its never too late, i started a thread about this a couple weeks ago and got some good feedback. Check it out. I live in TX also and it has been real hot and only goin to get hotter. I would flush system and install coolant filtration kit. and go with ELC by prestone.
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post #3 of 8 Old 06-30-2012, 07:48 AM
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Look.... with outside temps at 100*, a heavy truck, and highway speeds, you need to just watch to see what is going on. You go down a big hill, your coolant will cool WAY quciker than your oil. Quick spikes like that are ok. Its when its an all the time thing. When I tow I will see things like that now and then.

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post #4 of 8 Old 06-30-2012, 10:48 AM
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i run heavy also. i ve seen my ect hit 215 but my eot is alwas close enough for the 15degree difference. never gets above 10 apart. still a stock truck running the gold. now are these numbers accurate as the paramiters are for an unloaded, not towing on flat ground at cruising speed. no, we are not towing, but it was heavy enough to be sitting on the overloads before my airbags lifted the *** end 3 inches.

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cut me some slack, its a work truck.
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post #5 of 8 Old 06-30-2012, 02:32 PM Thread Starter
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Thanks for the replies.

The scary part is that when I drive, the temps rise for as long as I drive. I usually drive no more than 30 minutes to a job.

I noticed that if I stay about 50 mph the temps do much better. But I make a lot of people mad trying to pass me LOL.

2004 6.0 F-350
Service Body-Truck weighs 13,000+ lbs
120K miles and counting
Munice Hydraulic PTO
Std. Transmission
Edge Insight CTS
Bone Stock
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post #6 of 8 Old 06-30-2012, 02:48 PM
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At 13k you have to consider that is like towing a 5k or 6k trailer for most of us. In 95-100 degree weather your truck is going to run warmer and your delta is going to be larger than a stock empty truck. My CCLB will see temps of up to 205+ ECT and 217 EOT in gridlock stop and go traffic. I am running a BPD remote oil cooler so my temp delta doesn't have the significance that yours does but in hot weather expect it to run hotter. Keep an eye on the delta and if it is consistently 20 degrees or more then you have a problem. To make clear that is based on the 13k weight of your truck and not an average guideline for a typical stock truck.
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post #7 of 8 Old 06-30-2012, 05:56 PM
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Thanks, great info for me also. I run heavy too. I like the trailer to truck weight comparison.

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post #8 of 8 Old 08-01-2012, 11:51 PM Thread Starter
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Uh oh. Been seeing temps in the 215* range and above.

Did a coolant flush and swap to ELC. Ran her hard for 30-40 minutes, EOT goes up to 220* and climbs for as long as I drive. ECT stays around 190*. Time for a new cooler I think.

2004 6.0 F-350
Service Body-Truck weighs 13,000+ lbs
120K miles and counting
Munice Hydraulic PTO
Std. Transmission
Edge Insight CTS
Bone Stock
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