New Cooling/fan question

That missing shroud will iad overheating even on the highway....been there, done that.....you need a shroud......and aside from your stat, which could definitely be causing you grief (along with a high volume pump), it sounds like you're just plain crudded up in there.

If you had NO problems before the high volume pump, look there.......but you need to eliminate some possibilities...........You didn't say when it started, or even if it was normal at one time specifically............

I had a brand new stat make my car overheat like that........I said it couldn't be the stat.......finally changed it, and it was cool. BUT, I also had a tired radiator cause the same thing.......just too coated inside to be efficient anymore.........check the connections for your coolant system.......look clean? Feel clean?.........Really slimy?..........Could just be time for a radiator............BUT, change out the stat FIRST to be sure............

Though I'm not a fan of the high volume scene, I'm not sure about the water pump.........All I can add is that I've used high volume oil pumps with devastating results.........some of these "high volume" tricks are just too much for efficient cooling and lube.

Just my 2 cents (actually, about 8 cents in todays market.....) :read2: