Poor man's climate control.
Perusing the circuit diagram indicated the thermistor shut-off on the evaporator would be a good place to insert this little unit, with the bonus of easy access.
The thermostat is a W1701 unit I grabbed from ebay for under $5, the switches set the temperature control.
In this case the power from the A/C switch is provided via the orange wire, and if the temperature is high enough then it's passed back via the red wire, enabling the A/C compressor to kick in.
If it works OK I should put the icing thermistor back in circuit in a series manner, but for now I'm in the tinkering phase.