Some fan clutches have reverse threads not sure about yours though.

 

hmm, well the part on the website says oem standard replacement. so we'll see. im not to worried about the threads. but thanks for the heads up I'll definitely ask about it thats for sure.

 

Anyone figure this out? I have been dealing with the exact same issue for about 8 months now... Replaced radiator, fan clutch, water pump, radiator cap, thermostat, checked for pressure and exhaust fumes...NOTHING WRONG
Runs great for a few weeks, then sends fluid to the radiator. Siphon the fluid and it is exactly the same amount needed to fill the system back up to level and leave the overflow tank at full.
Runs and idols like new, sounds great except for the fluid issue...
Burped it last night, ran highway speeds for 4 hours, gauge never went past the 1/3 mark. Checked the fluid level in the tank - almost overflowing...

 

the fluid level in the tank is supposed to go up when the truck is running, that is why the tank is there to fill up with as the fluid expands out of the radiator, as the truck cools down it sucks most of it back in.

 

Ok... just read through all 19 pages of this...

Losing coolant means a leak. Plain and simple. Either its a leak nobody wants to have, or a leak built into the system (the overflow tank drain for when it gets too full). The pressure test and hydrocarbon test coming back negative will confim or not a head gasket. If not a HG, then start looking for drips, dried coolant, corrosion, or any other sign of where the leak is. The pressure test can also help with this.

As far as the engine temp increasing when in stop-and-go traffic, thats normal, as long as it doesnt go too high! And its perfectly normal for the temp to quickly drop when you start moving at a higher speed (ussually 30 - 40 mph you will notice the temp dropping rather quickly). This happens due to more air flow through the radiator.

Can there be things that cause more dramatic changes? The answer is "yes!" Between everyone here i think just about everything was covered except maybe coolant leaking into the tranmission fluid via the radiator (on the models that have tranny coolers built into the radiator).

This should be an end all thread for anyone with cooling issues, I think just about everything is covered! Lol.

 

I do not recommend this at all, but a buddy of mine was frustrated with his truck, a 98 Ram with the 5.2. His was always over heating, no white smoke, he dang near replaced half the motor...we placed a piece of cardboard under his truck to see if there were any leaks..nothing. He went and bought that blue devil head gasket sealer..never had another issue, and has put another 120,000 miles on it...NO I do not recommend that, but it worked for him

 

it seems to me the problem might be something in the ball park of weak flow through the system idling and the increase in rpm spins the fan and helps force a little more flow through the whole cooling system. Thats why the temp increases. as far as the overflow it seems like coolant backs up into the overflow but isnt getting sucked back in. flow through the hoses seem fine. I cant figure it out personally. either i lack knowledge of motors ( I do) or I dont have the skills to figure it out ( I dont) So I'm stuck playing the wait game of maybe something will fail or go out and it'll end finally.

I took it to a shop and they guessed water pump. Paid to fix that and that was not the problem.