7.3L 2002 F350 Overheating - Ford Powerstroke Diesel Forum
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Old 06-10-2013, 06:08 PM
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7.3L 2002 F350 Overheating

Hi guys,

On a recent trip, I had some over heating issues with my 2002 F350 7.3L Diesel. Truck is stock with a DP Tuner in it for Economy. Truck has had a very easy life for the most part.

I was pulling a 3000lb load, and had my coolant gauge, much to my surprise, rise and almost peg out to H (I let off it before that happened). Any uphill incline or if I stayed on it above 70~ MPH, I'd see the coolant needle temp climb rapidly.

We limped the truck back and home, not letting it overheat.

Once I took the trailer off, the truck temperature behaved normally. I could cruise on the highway and it never reached above the middle range.

I had taken the same trailer/load on a similar trip two weeks before this, and had no issues.

No coolant leaks that I can see, my overflow tank was still full. Truck had some water dripping out the passenger side, but this appeared to be from the A/C running.

I've replaced the radiator cap, and I have a new thermostat to install.

I took a look at the fan clutch, and after letting the engine warm up, I am able to turn the fan by hand with the engine off. It was suggested to me that this is indicative that the fan clutch is shot.

Any other suggestions on what to replace? Really hard to get confidence I've fixed it, as it only happens while towing.

I appreciate your guys help!

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Old 09-08-2013, 04:56 PM
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hi I am having the same problem on my 2001 7.3 did u ever figure your problem out thanks
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Old 09-08-2013, 05:10 PM
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You had a coolant gauge? Aftermarket or just the dash gauge?

7.3s RARELY overheat. I would of course check coolant level. Thermostat usually sticks open, causing low temps instead, but doesn't hurt to replace it.
Fan clutch should be making that fan roar. In 100*F temps and AC going, my fan clutch kicks in after some hwy cruising, and then stopping and starting again. It's obvious it's pulling extra air.

I would even guess maybe your ECT sensor is bad.
Is your coolant clean or oily?
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