Overheating issues or something else? - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 07-25-2013, 06:05 PM Thread Starter
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Overheating issues or something else?

I have a 2008 FORD F350 6.4 King Ranch that's been having an "overheating" issue. This only happens when I'm on the highway. The green tool light will come on and a few minutes later the truck will suddenly "overheat" - when I pull over on the side of the road the temperature gauge will go down as fast as it went up and be fine for another 30 minutes than suddenly "overheat" again down the highway. I get error code P012F - Does anyone have an idea what this might be?

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post #2 of 8 Old 07-26-2013, 06:15 AM
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Maybe the coolant temperature sensor?

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #3 of 8 Old 07-26-2013, 08:53 AM
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May be a bad oil cooler.Threshold may have been exceeded between the engine oil and the coolant.

DTC P012F stored and wrench warning lamp illuminated when the oil coolers efficiency drops below a specified threshold for a given speed and vehicle load condition.
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post #4 of 8 Old 07-26-2013, 08:35 PM
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Get it checked out ASAP! Those are the early warning signs of a potentially much larger problem! Check the coolant level...

08 F350 CCLB 4x4 Lariat Job 3
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post #5 of 8 Old 07-27-2013, 06:14 PM
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Replace thermostats first. If it still does it then its your oil cooler.


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post #6 of 8 Old 11-26-2013, 08:32 PM
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i just had the same problem. Turns out it was a blown radiator. The radiator had been leaking enough that the computer determined there wasn't enough coolant fluid to cool the engine. It went into limp mode and I got it to the dealer (extended warranty) in time. But that problem also ended up killing the oil cooler and an EGR. The 4k warranty is totally paying off!
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post #7 of 8 Old 11-26-2013, 10:44 PM
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I heard that the Radiator caps need to be changed out annualy wheather it looks bad or not. Tech says all motor overheating issues that came into his shop had a defective or inoperative cap. blown motors due to the cap!
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post #8 of 8 Old 11-27-2013, 06:00 PM
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Its not necessary to change it annually...albeit, they are very inexpensive, just periodically test it to see if it is still holding pressure and also releasing pressure when it's supposed to. That little cap can, as you said, lead to many other issues... I put a new one on mine when I did the lower hose!!!

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