bad thermostat or bad oil cooler? - Ford Powerstroke Diesel Forum
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Old 07-15-2014, 04:23 PM
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bad thermostat or bad oil cooler?

I have a 04 with a late 04 6.0 and I noticed today while driving in various speeds on various inclines that my deltas particularily the ect is abnormal. While driving I observed various deltas between 4* and 20* differences for example at one point they were 186 & 190 and as far apart as 184 & 204 the eot seemed consistent it was the ect that kept jumping. Could the fact that it was 30*C outside have something to do with it? Im hoping its just the t-stat but I have no idea what a failing oil cooler looks like either
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Old 07-15-2014, 04:59 PM
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for a good delta test you want to get on a nice flat long road. No towing or racing just crushing at 55-60mph. You ect and eat should settle out fairly quickly and be within 15*.
Running up a hill or acceleration will quickly fowl the test.
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Old 07-15-2014, 05:03 PM
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I will give it a shot just never seen that big of a spread except for when towing through the mountains on the other hand as well I have never seen the ect fluctuate as rapidly as it was.
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Old 07-15-2014, 05:05 PM
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A tstat is quick and easy thing to rule out.
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Old 07-15-2014, 05:07 PM
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Guess I will just have to pull it and take a look
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Old 07-17-2014, 08:08 AM
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EOT/ECT should never be more than 10* apart. I've never seen a failed t-stat in a 6.0 either. You can try replacing it first and seeing if it makes a difference, but I'm thinking your oil cooler is the problem. If you end up replacing your oil cooler, make sure you flush the cooling system throughly and use Ford's VC-9 iron block flush.
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Old 07-18-2014, 09:31 AM
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I put new oil cooler lately and driving my dually with heavy camper -delta would stay at 8 degrees, peaking at 11 when I kept the foot on the floor for couple of minutes taking long grades in Sierra.
You can read more details in my topic about coolant spitting.
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