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Old 08-16-2009, 08:58 AM Rookie

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runs hot with load behind it

well ive got a 2004 6.0 f350 and its been a good truck . but i was pulling a skidsteer and went up a hill the temp shot up to the roof . then drop back down with in 30 sec . so i said oh well drove it for a another 3 months no problems hook my rockcrawler behind it and was going then the first big hill it shot up again and back down 5 or 6 times then stayed hot . so i pulled in a adavnce auto and put a thermostat in it hoping it was sticking.

filled it with water the road made it another 50 miles run hot again . so we got some food came back out and it was 1.5 gal low filled it up and drove another 50 miles to the park . then started home and the same hill it overheated again so pulled over and filled with water and came on home with no probs .

so if anyone can understand all that .. any ideas what it could be ?
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Old 08-16-2009, 09:18 AM
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If it's still under warranty get it in to the dealership/shop quick.

You've got a either got a busted EGR cooler, oil cooler plugged, or popped head gaskets. Or all of the above. But I guarantee you it's one or more of the 3...

Good luck and welcome to the .ORG.
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Old 08-16-2009, 09:25 AM
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Welcome to the org. Sounds like head gaskets. Is your fan coming on?
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Old 08-16-2009, 12:25 PM Rookie

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yes fan is coming on and its got 160000 on it so no warranty but what the oil cooler plugged how does it make it run hot
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Old 08-16-2009, 05:24 PM
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Ok, Oil cooler run in series with EGR Cooler. The oil cooler is water to oil, and uses coolant to remove heat from oil. This is transfered out to radiator by coolant. If oil cooler gets plugged, the EGR cooler(which cools the exhaust gas that is recirculated in your engine for emissions purposes), will overheat, thereby causing pressure spikes in the cooling system, thus causing coolant loss out of the overflow bottle.

Also, International uses "stretch" bolts to secure the heads to the block on these engines. They supposedly "improve clamping uniformity" during assembly, but in reality, all they do is end up "stretching" more, and over time and under heavy load, they literally allow the heads to "lift" off of the block during heavy loads. This allows combustion gas to enter your cooling system, also causing pressure spikes, air bubbles, loss of coolant, and overheating during loading. Pretty common problem. So common in fact, it one of the main things to repair to make a 6.0 reliable. The EGR heat issues just make the head problem worse.

So to fix your issue. you should do the following. Even if the gasket are not blown now, they eventually will, and can leave you stranded.

1. Replace head gaskets. Use ford oem parts, except for the head bolts. Replace these with ARP head stud kit.

2. Delete EGR system completely. There are vendors here that sell complete EGR Delete kits.

3. Install Coolant Filter system. This will prevent any gunk from getting into your oil cooler. Also when head gaskets are done, is good time to replace this.

4. (optional, but recommended) Reprogram computer with SCT tuning software. Eric at Innovative Diesel has one of the best reputations around. This will vastly improve the performance of your engine, reduce EGT during towing, and improve mpg.

This does not come cheap, but in the end, you'll have a completely different truck, and reliable to boot.
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