Ok, I've been worried that I've had a cooling problem since my 83 240D heats up on the freeway rather than city. Today it was 110-113oF and I was driving kind of uphill with the A/C on (of course

) and the temperature guage rised to dead middle between 120 and the white line above 80 (so i'm guessing between 90-120) and just sat there... Is this normal under these conditions?

Or should I be worried?, I was told the radiator cores might be blocked but after looking at them and washing them it's still doing it... but it's under hot conditions. what do you guys think? Thanks again!!