6.4 water temp spikes fast - Ford Powerstroke Diesel Forum
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Old 10-21-2012, 09:04 AM
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Exclamation 6.4 water temp spikes fast

Hey guys, I think I have a problem with my 08 super duty. I have been chasing this problem since I bought it back in November of 11, it had hot coolant under load since then. First thing I did was a full delete, PDF, egr, are stage 2, and a h&s mini max, first time I had it happen I had the egr cooler still in place. So when I pull it down and make it pull a hill with trailer once it hits over 35-36psi the temp starts to climb to approximatly 208-210*F then it spikes fast within 3-5 secs the temp jumps to 220+ and It starts to puck coolant. And this happened at just below freezing. My truck has 187 000 km on it. Only had 175 on it when I bought it. The previous owner had a superchips tuner, no gauges and a PDF still on it, he pull with a 125 horse tunne. I am thinking it is head gasket failure. But I'm not sure. Let me know what u all think.
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Old 10-21-2012, 09:09 AM
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well it's made to vent excessive pressures and those temps would cause it

so head gaskets aren't an automatic culprit in my book

does it ever get that high of boost on the streets ?

any other temperature issues other than towing ?
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Old 10-21-2012, 09:18 AM
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It can to high boost on the street, but I prefer not to do that, when it does its not for long. I find it always runs on the hot side, but what's hot. My fan kicks in at about 215 220. Most of the time it runs around the 200-205 no trailer high way speeds.
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Old 10-21-2012, 09:20 AM
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The thing that gets me is how fast it climbs. It's crazy, the fan has no chance to come on and it barffing coolant.
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Old 10-21-2012, 09:35 AM
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ya thats a fast spike

like water isn't circulating properly due to a radiator blockage or water pump issue

but thats a wild arse guess
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Old 10-21-2012, 09:45 AM
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Ya. I have checked my rad, i washed/blew it out, only other thing that i was thinking is like u said water pump or maybe even a t-sat.
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Old 10-21-2012, 09:53 AM
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check the water pump. t-stats fail open.

bailey
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Old 10-21-2012, 10:20 AM
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But if it was a water pump wouldnt it heat up and stay hot? On my farm thats what i have seen. It would be the same as if the belt failed right. It heats up fast, but it cool down just as fast when u take ur foot off the throttle.
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Old 10-21-2012, 03:22 PM
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Check the thermostats.
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Old 10-21-2012, 06:15 PM
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Headgaskets aren't out of the question on a tuned 6.4
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