Tjunction is the temp measured at the CPU on-die thermal diode's semiconductor junction. The CPU temp reported e.g. in the BIOS is normally the temp of a temp sensor on the MB right under the CPU.
betrayer, sorry no one has given you the right answer yet. You are obviously refering to the Tjunction seen in Core Temp. From the Core 2 Duo Temperature Guide:
Troubleshooting
(H) Core Temp shows Tjunction 85c. This field is Intel's Tj max spec, is info only, and does not change.
Since air coolers can only lower the temp to (at best) the temp of the air in the case, perhaps you don't have enough airflow through your case. A decent cooler with decent airflow should result in an idle CPU temp only a few degrees hotter than ambient air temp.
betrayer, there are 3 sensors which read 2 distinct sets of temps differing by 15c. As you haven't defined your results or variables, I can't help you without specific information. Please read the Core 2 Duo Temperature Guide then re-post your info using the "Results" and "Variables" format shown in the Guide.
Temp2 is Tcase, and the Cores are Tjunction, which are all fine, and are proportional to the high ambient temp. It doesn't leave any ceiling to OC or increase Vcore, but that's OK.