Overheating? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 17 (permalink) Old 01-11-2012, 03:56 AM Thread Starter
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Overheating?

I recently pruchased a bone stock 08 CC DRW 4wd manual trans, absolutely love it. Here's the problem....my temp gauge has stayed just a hair to the left of dead center straight up while driving since I got it about 2,500 miles ago, runs great no problems. Today I put a 15k tractor on my trailer and headed down the road, pulled it no problem, easily I thought. Then it started pegging the coolant temp gauge out about every 5-10 miles. It would go from normal to pegged instantly and the reduced power would come on. I pulled over checked the fluids and every thing was full and dry. The gauge would go back to normal and few miles down the road it would go from normal to pegged again, instantly. Got rid of the tractor and didn't do it again all the way home. Any ideas? thermostat? I'm new to the 6.4s and was really loving it until tonight.

SOLD...early 99 F350 CC 4WD SRW, Tymar intake, 4 in. turbo back straight pipe w/ 5 in. tip, DP tuner, 203 t-stat, Timbrens in the rear, front leveled, King Ranch wheels, ISSPro gauges, Weston brush guard, rebuilt my trans using a Torqueshift converter
08 CC LB DRW MT 4WD Ranch Hand bumpers...stock for now
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post #2 of 17 (permalink) Old 01-11-2012, 02:26 PM
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Bad thermostats perhaps? You don't hear of many overheating issues with the 6.4 since it moves a huge amount of coolant and has a large radiator.
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post #3 of 17 (permalink) Old 01-11-2012, 09:29 PM
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My money would be on the sensor for the gauge. Did the fan come on?

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post #4 of 17 (permalink) Old 01-11-2012, 11:11 PM Thread Starter
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The fan was running, but I figured it might since I was pulling a trailer, and especially if it thought is was in a overheat or hot situation. It was just strange how it went from normal to pegged instantly but went back to normal gradually.

SOLD...early 99 F350 CC 4WD SRW, Tymar intake, 4 in. turbo back straight pipe w/ 5 in. tip, DP tuner, 203 t-stat, Timbrens in the rear, front leveled, King Ranch wheels, ISSPro gauges, Weston brush guard, rebuilt my trans using a Torqueshift converter
08 CC LB DRW MT 4WD Ranch Hand bumpers...stock for now
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post #5 of 17 (permalink) Old 01-12-2012, 01:03 AM
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My money would be on the sensor for the gauge. Did the fan come on?
The symptoms sound to me more like it really was overheating, not a flaky sensor since the issue disappeared once he was no longer towing. It sounds to me like something is preventing proper coolant circulation and since we know there have been issues with the thermostats, that would be my first suspect to investigate.
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post #6 of 17 (permalink) Old 01-12-2012, 01:52 AM Thread Starter
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That's kinda what I was leaning toward, but the instant jump in temp was throwing me off. I haven't really looked at it much, how hard are they to get to?

SOLD...early 99 F350 CC 4WD SRW, Tymar intake, 4 in. turbo back straight pipe w/ 5 in. tip, DP tuner, 203 t-stat, Timbrens in the rear, front leveled, King Ranch wheels, ISSPro gauges, Weston brush guard, rebuilt my trans using a Torqueshift converter
08 CC LB DRW MT 4WD Ranch Hand bumpers...stock for now
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post #7 of 17 (permalink) Old 01-12-2012, 03:40 PM
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The instant spike makes me think some sort of thermostat issue preventing coolant flow and then it clears and the overheated coolant hits the sensor and spikes it, followed by a gradual cooling to normal temp and the issue repeating. The docs mention airlock issues, but I'd think that wouldn't consistently repeat.

http://wpnet.us/64_cooling.pdf
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post #8 of 17 (permalink) Old 01-13-2012, 01:08 AM Thread Starter
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I agree completely, thanks.

SOLD...early 99 F350 CC 4WD SRW, Tymar intake, 4 in. turbo back straight pipe w/ 5 in. tip, DP tuner, 203 t-stat, Timbrens in the rear, front leveled, King Ranch wheels, ISSPro gauges, Weston brush guard, rebuilt my trans using a Torqueshift converter
08 CC LB DRW MT 4WD Ranch Hand bumpers...stock for now
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post #9 of 17 (permalink) Old 01-13-2012, 09:08 PM
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ck for coolant leaks and proper coolant level first. t5hese units have rad o ring seals and rad leaks..
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post #10 of 17 (permalink) Old 01-15-2012, 05:55 PM Thread Starter
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Everything was full and dry, first thing I checked.

SOLD...early 99 F350 CC 4WD SRW, Tymar intake, 4 in. turbo back straight pipe w/ 5 in. tip, DP tuner, 203 t-stat, Timbrens in the rear, front leveled, King Ranch wheels, ISSPro gauges, Weston brush guard, rebuilt my trans using a Torqueshift converter
08 CC LB DRW MT 4WD Ranch Hand bumpers...stock for now
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