I was just thinking about all the folks who've been overheating lately, and wondering how many of you have underdrive pullies. Is it possible that the pullies aren't allowing the waterpump to spin quickly enough at idle to circulate the coolant? Or is the waterpump spinning faster, not allowing the coolant to stay in the radiator long enough to be cooled?

Just a thought...

 

...and hopefully the folks with clutch fans have their fan shrouds intact also...

 

electric fans also...if they have the ls1 fans..thats what i have and when i would let it set for a little while the temp would get around 220-225

 

Nope, stock crank pulley here. I think my problem is the radiator. Have a new one to change to as soon as I get a chance to do it.

 

The only time I ever had problems cooling was when I had a clogged 34" rad. With the ele fans or the clutch. Try swapping back to the smaller stock one or try a brand new radiator.

I got my brand new 34" Rad on eBay for $230 shipped I think, came with trans cooler, oil cooler, and a drain tube(no drain on my stocker, or oil cooler, bonus!)

 

I've got the flex-a-lite 295 fans, 28" radiator, and Underdrive pulley.

 

its funny you say that their is a gut that live not to far away he put in a 5.7 in an e-cab truck. about a month ago he put pulleys on it and it started over heating put stock pully back on an solved the problem.

the only thing is i have an ele water pump

 

Ah ha, the plot thickens! It makes sense...