my car runs 10-20 degrees warmer on the highway then it does just driving around the city?
i have a csi electric water pump, 160 * and the fans set to turn on earlier.
driving around the city its sits between 180-190 on the highway it goes to around 210 any ideas?

 

Be sure your air dam is on and look for the St. Louis Post-Dispatch sucked up in front of your radiator.
It would not hurt to check for any air in the system with the bleeder screws.

 

yeah i checked that stuff. i might try and bleed it again

 

Are you sure your fans are coming on??

 

yes im sure

 

Every time I swap my rad fluid in spring I have to bleed it quite a bit.

I bleed it in my driveway then go for a drive and as soon as it gets stupidly hot I bleed it again from both screws and fill the reservoir.

 

That seems to be a typical side-effect of an electric WP. The city driving your car stays cooler, but on the highwy it heats up a little more. The WP flows a constant volume no matter what, when you're in the city it's more than required to keep the car cold.. when you're driving down the highway you've got a constant loading condition going on and they seem to get a little hotter, nothing too major, just warmer than driving around town.

My car runs at 175* just normal driving around town. That's with the CSI, and a re-programming of the fans to 172 & 178 respectively. When I get out on the highway and am just crising for a while it gets up to about the 200* mark, but not much higher.

 

cool, im glad im not the only one having this problem... i guess i wont worry about it

 

Somthing that frequently gets overlooked with overheating problems is the pressure cap. An LT1 OEM radiator pressure cap is around 18 PSI, or about 4-5 PSI higher than a regular 350. These things are only a few bucks but they can sometimes make a big difference. If your system is not operating at the correct pressure it will not operate correctly.

Another thing you might want to check is that sometimes debris can get in between the radiator and your A/C Condensor. When I removed my radiator (due to an overheating problem) it looked like a mouse was building a home in there.