There is a post here somewhere about this exact issue. Might want to look up parts yourself before you even set foot in a parts store.

 

I always do so I can give them the part #

 

As a quick update, last winter my truck ran hot and even overheated once when running it on the road with the plow attached. I also mentioned that the upper rad hose never got hard. Someone mentioned I had to have a leak and up until not, I've only topped off the overflow tank maybe once or twice with very little antifreeze.

Although as of today, the upper hose still remains soft after the truck is totally warmed up, the truck runs at normal temperature with little variation. I can assume the thermostat is fine or I'd still have the overheating problem, but I can't believe that this 2500 with a V10 would run hot with a plow attached. I do know that the plow can block air flow, but on a heavy duty truck like this, I would believe it wouldn't be effected as such.

One strange thing is, on occasions, I do see that the hose from the overflow tank does leak out some antifreeze, but the level is always at the minimum marker. Somehow the antifreeze gets out of the hose without me seeing it and when I do, the level isn't high. This truck is playing with me and I don't like it ... lol

Any suggestions would be appreciated, as I'd like to figure this out before winter sets in again, especially if there is something I can do to prevent it from overheating with the plow attached. Either somethings not working properly, such as with the upper rad hose staying soft, the overflow tank leaking out antifreeze out the hose when the level isn't high, or I need more air flow to the engine with the plow attached.

 

If the plastic is worn where the radiator cap seals, it won't build pressure. You would need a new radiator. Make sure you have the right cap. The pressure comes from the antifreeze getting hot and expanding. You could also rent or buy a pressure tester.

 

I tried two different caps, one from Napa and another I bought online. The system I was told is a close system and Napa couldn't confirm the cap they sold me was for a closed system or not, just that the part number was for my truck. But the one I purchased online specified it was for a closed system. Neither cap made a difference.

I will check the radiator, as it definitely looks old and rusty and look into getting a pressure tester.

Thank you and I'll update as I get more info in hope it will help others.

 

Yeah, pressure test the system. Somethin' ain't quite right there.