Yes the stock Cobalt fans (there are 2 on the front radiators) are on and off based on the temperatures set in the PCM tables.
HP Tuners makes it look like the fans are variable speed with the "% of fan desired" in the tables, but the PCM just uses these tables to turn on or off the relays, giving us off/low/high fan speeds. Or off/high speed if you don't use the SER/PAR relay, like the goblin is wired to do.
When Fan 1 is requested and Fan 2 is off, then the SER/PAR relay is off, and then both fans run at 6V. In the goblin Fan 1 would run at 12V.
When Fan 2 is requested then both the SER/PAR relay and the Cooling Fan 2 relays are energized, and Fan 2 goes to 12V.
When both Fan 1 and Fan 2 are requested, then all 3 relays are energized, and both fans run at 12V.
The voltages for the A/C pressure sensor (not a switch) don't really matter, as HP Tuners doesn't show us what the stock sensor voltages are. When you wire a new sensor to that circuit, then ECM will read the voltage , and convert it to a KPA (0-3000 Kpa range) and it will turn on and off the Fan 2 relay based upon the tables in HP Tuners.
You will have to calibrate your new sensor using the Kpa tables in HP Tuners.
(either the Fan State Transistion Desired vs Current State table
and/or the Fan Desired % vs AC Pressure table.)
Here is the 5V wiring for the AC pressure sensor. (HVAC Diagram 2)
It shows the AC Pressure sensor has a black 5V- wire, a grey 5V+ wire, and the returning sensor (0 to 5V) wire is red with a black stripe.
The sensor is located pretty close to the AC freon pump.