Is this cable meant for metal case grounding?
If it has two wires on the end that plugs into a PCB, then it is a thermistor. Measure the resistance, and it should come in at a value that is 10KΩ's (could be more, but this is the usual value.) By the looks of it, it is there to measure the temperature of the air (as it isn't thermally connected to the case). A lot of thermistors I use look like this in my designs to measure ambient temperature.