climate-control specific:

1 - in-car temp. sensor reading;
2 - outside air temp. reading;
3 - left heater core temperature sensor;
4 - right heater core temp. sensor;
5 - evaporator temp. sensor;
6 - engine coolant temp. sensor;
7 - refrigerant pressure (in bar) – to convert to psi multiply by 14.7;
8 - refrigerant temperature at receiver/dryer;
10 - blower regulator control voltage (1 to 6 volts);
11 - emission sensor voltage (2.1 volts is about normal);
12 - sun sensor voltage (drops as light increases);
22 - vehicle speed (mph);
24 - battery voltage