[lckelly]

Just replaced oil cooler seals and flushed the coolant system. I am towning 9k lbs and 50 miles in the temp jumped from 195 to 260 in a matter of seconds. Any ideas? I'm sitting on the side of the road trying to come up with a plan

 

[lckelly]

Car gauge pro shows no new codes. Engine still runs normal. Just over heating causing coolant reservoir to overflow

 

[DENNY]

Thermostat issue? Did you replace it when you did the flush, may be bad or wrong one.
DENNY

 

[RT]

Maybe didn't get all the air out of the system and got a pocket trapped in the back of the engine. Once it boils - even in one area - it quickly displaces coolant and heats up quick.

Denny may be on to something if you pulled your thermostat - especially if you replaced it with a short stem version instead of the correct long stem thermostat.

 

[lckelly]

Yeah, i forget to add that I added the thermostat when I flushed the coolant system, there was not one in it when I started. I went with the motorcraft recommended thermostat (195 degrees) and probably put 20 miles on it since then just to get it circulating. I recently bought the truck which had a ton of oil in the coolant reservoir. That is why I replaced the oil cooler seals, flushed the coolant system and installeded the thermostat. I just found it weird that it was towing fine up and down hills at a constant 195 degrees and then suddenly, within 5 seconds it was at 260. I shut it down fast, got towed home and now I guess I'll look for leaks and anything obvious. If it were a clogged radiator or bad water pump, wouldn't i see the temp climb slowly?

 

[RT]

What was the part number on the thermostat? If it was a short stem which fit the 94-97 models it would cause the issue you are having. That thermostat prevents flow to the rear of the engine.


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[lckelly]

I used Motorcraft RT1201 Thermostat.

 

[lckelly]

The consesus is that it must have had an air pocket somewhere so I gave it another thorough flush today AND (sarcasm) did you know that you shouldn't use the normal green O'reilly's antifreeze. Well I learned that today while doing some research. So Ole Reliable(more sarcasm) is now full of 50/50 mix of Rotella ELC and distilled water. I drove it enough to get 195 degrees and build pressure. I think I'll drive it as a daily driver for a week or so before I attempt to pull the camper to the deer lease again. Thanks for the help and education guys.

 

[Gator5713]

Yeah, the green can cause problems. It'll eat the glue that holds and seals the injector cups and the you're really in a pickle.