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Did you figure out the cause of your overheating issue? I have a similar issue that just happened today!! I am hoping to get some info ASAP. I might need to get it into a mechanic as I just don't have the time to deal with it!
My 2002 F-350 7.3L overheated on me for the first time today. I was towing heavy, and it was hot, but I’ve towed heavy in the heat before. The temp gauge hit H on pulling a hill (I must have not looked for a few minutes), and I immediately backed off the throttle and turned the heater on high to dump the heat load. There was also some intermitent high-pitched squealing that seemed to start only as the truck was very hot.
Engine is stock with an Edge Evolution programmer in Stage 1. Truck has 176,000 miles.
No obvious coolant leaks.
No white or other odd smoke, just some very light sooty exhaust.
The coolant level in the overflow tank has never stayed at the “min” mark, which of course I’ve always been curious about, but I have not had issues in the past. So let’s say I fill it up to Max at cold temp, after driving, it will be below the Min line, even when hot. Have never noticed any leak. And it has never dropped below the mark that it “settles” at.
New water pump at 148,250
New 203deg thermostat from Dieselsite.com at 148,250 miles
Coolant flush at 148,250
Used Fleetrite ELC coolant as per:
Fleetrite ELC is approved and suggested by International. Can get from an International dealer. Same as Rotella ELC. Supplied to International by Shell. These are OATs. Definitely 2/99 and up are okay for OATs (but not pre 2/99 as some seals etc. were updated after this point and pre-2/99 were not hence the incompatibility). Can also use CAT ELC, Mobil 1 ELC, Prestone HD ELC, Zerex Extreme ELC, Peak Final Charge ELC.
New de-gas radiator tank (had some cracking - I was thinking/hoping this was why my coolant level would never stay full, but it didn't change anything), upper and lower degas bottle hoses, & new radiator cap at 152,000
New OEM Motorcraft fan clutch at 170,000 miles - this actually jumps out at me as the thing that “changed” most recently and might tell me something. This was the first time towing with the new fan clutch. The old one was definitely stuck on, so I’m wondering if this confirms that I have always had a cooling system issue, which has always been “offset” by the malfunctioning fan going 100% full-bore at all times, and now that the fan is actually operating per spec, the coolant system issue is rearing its head?
Thanks for any info!!!