I fixed these a while ago, but am adding the $8 intercooler
pump fix, and the fix to the radiator fan, to my build log.
I finally figured out how the fans work on my 2006 Cobalt SS. I was able to reduce the temperature that the fan turns on at, which was pretty high (223F on, 217F off) on the factory chevy settings. This is HP Tuners, VCM Editor software:
Fan 1 is my engine coolant fan, (purple lines), it switches on (1) when the engine temp is higher than ~205F (which is "Fan Desired" = 22).
Fan 1 switches off (0) when the engine temp is lower than ~199F (which is "Fan Desired" = 12).
The blue lines are for reading the AC system vapor pressure sensor, and then turning on/off Fan 2 according to the tables above.
Or in a Goblin, since we don't use the AC system, you could put a different 5V sensor instead of the AC system vapor pressure sensor. Maybe a 5V oil pressure sensor. Then the PCM would read the new oil pressure sensor, and report on it on the AC pressure PID. I'm not sure what PID that is, but I know HP Tuners can see and report on it.
Wikipedia doesn't list the AC Pressure sensor... unless it is one of the Evap system pressures:
Maybe the Evap vapor pressure sensor could be repurposed too?
PIDs
(hex) | PID
(Dec) | Data bytes returned | Description | Min value | Min value | Units | Formula[a] |
05 | 5 | 1 | Engine coolant temperature | -40 | 215 | °C |
|
32 | 50 | 2 | Evap. System Vapor Pressure | -8,192 | 8191.75 | Pa |
(AB is two's complement signed)[3] |
53 | 83 | 2 | Absolute Evap system Vapor Pressure | 0 | 327.675 | kPa |
|
54 | 84 | 2 | Evap system vapor pressure | -32,768 | 32,767 | Pa |
(AB is two's complement signed)[3] |