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Cases don't have thermometers. Neither do fans.
The sensors are usually on the motherboard or in the CPU.
The fan control points on the motherboard should indicate whether they are sensor bound, i.e. the heatsink always is, and the case fans seldom are.
You may be able to move the case fan lead to another power jumper that has a control and then achieve what you want.
Though... is it an issue? 85'c for a CPU isn't a lot, and the heatsink handles that, and the ambient temperature within the case isn't a big deal and even a slow case fan will clear it shortly (and nothing is going to overheat in the interim).
Velocio
A PC problem that's really pissing me off.
One of my PCs spends most of its time under little load and has a passive CPU cooler so I don't need a fan. Occasionally it does a load of transcoding which currently sees the CPU temp get up to about 85 degrees.
I want the case fan to turn on at a certain temperature and off when it drops below that. The BIOS utility doesn't seem to make any difference to the fan speed,, just runs at full speed regardless.
LM-Sensors on ubuntu shows the fan speed and CPU temp but can't control them.
I've tried the 3 pin fan that came with the case and a 4 pin PWM fan and neither makes any difference.
Am I missing something obvious. Is there another option?
Fans with built-in temperature cut-off switches don't seem to exist. In theory I guess I could have something activated by USB but that's beyond my very limited programming skills.