Without stating the obvious, anyone know what the job of the speed sensor is on the rear of the A/C compressor?
At idle, my A/C runs fine for hours. After about 30 minutes of highway driving, it shuts down and won't start up again until the ignition switch is turned off and then on again and the process repeats. Been battling this for 2+ years. Independent--but knowledgeable--mechanic is stumped. Along the way, I've changed the following: Compressor, receiver/drier, expansion valve, in-car temp sensor, evaporator temp sensor, aux fan and pre-resistor fan relays, aspirator blower motor, compressor cut-out control unit, pushbutton switch assembly, 105/120 C temp switch, high and low pressure switches, mono-valve. The only anomally I can find is low output voltage from the speed sensor (but the system runs fine with this low voltage when at idle).
Anyone seen this type of problem before? Really need help.