Calm down ladies. And use a pinch of common sense.
#[member='guneshwor'] : you can stress test without fear. Your processor isn't going to fry, neither is the plastic going to melt.
Your chip has a safety mechanism to automatically drop clock speeds once it crosses Tjmax to keep temperatures under check. This has been in place since quite a few generations of Intel chips. This safety mechanism might be your ticket to proving that the cooling isn't functioning properly.
1) Launch Task Manager, and switch to the Performance tab that shows the CPU Usage graphs.
2) Launch Core Temp.
3) Launch Prime95 and stress test.
4) Observe Core Temp window. Once temperatures hit Tjmax, you will notice a drop in the Frequency as the safety mechanism kicks in.
A screenshot when this happens is enough proof to show that it isn't operating as expected.
Ps: Your response from Intel is technically correct considering they have designed the processor to operate under a wide range of operating temperatures. Cooling modules are designed by third parties, and operating temperatures can vary tremendously. But as long as it stays within Intel's max limit they cannot say its a problem.