Loosing coolant only under towing load - no overheat, not EGR - Ford Powerstroke Diesel Forum
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Old 05-10-2014, 07:21 PM
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Loosing coolant only under towing load - no overheat, not EGR

I have a 2008 F450 with 6.4L Powerstroke engine. It was losing coolant at a rapid rate – a gallon of mixture in less than 100 miles, probably especially when towing. The Ford dealer pressure tested and determined that the EGR coolers were bad, and replaced both. After that, the truck continued to lose coolant. I determined that if I was driving without tow load, it would not loose coolant. However, when loaded with my 36 foot LQ horse trailer, it would begin to lose coolant immediately. After 12 miles of loaded towing over moderate hills, coolant would be spattered all over the coolant bottle, and the level would have dropped out of sight. The Ford dealer couldn’t figure out what to do. I took it to a diesel shop and they changed the reservoir cap, cleaned the radiators (no help) and then recreated the problem on a dynamometer. On the dynamometer, under no load, the coolant system has normal pressure. When loaded, the coolant pressure climbs to above the level that the cap would release. The coolant temperature stays in the normal range under all conditions, and the radiator entry and exit temperatures confirm that the radiator is working a coolant is flowing. So, in summary: only under towing load, coolant pressure rises to the release point, but there seems to be no temperature problem. No white smoke, no water in the oil. Dumping a gallon of coolant for 100 miles of driving. What next? We’re going to pull the heads but we’re not sure that we will find the problem there. Think this is a good idea? What to look for?
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Old 05-12-2014, 06:22 AM
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Could be head gaskets.....pressurizing coolant system under higher boost values while towing would be my guess.
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Old 05-12-2014, 10:01 AM
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Agreed. It sounds like head gaskets.
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Old 05-12-2014, 10:07 AM
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another vote for head gaskets
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Old 05-22-2014, 08:50 AM
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+1....... ... ....
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Old 05-27-2014, 08:52 AM
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Mine was doing the same thing, it was stretched TTY bolts which led to gasket failure. It was fine empty, it would loose a little towing easy, if you pushed it it would puke over a gallon easy.
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