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
Anyone seen this type of problem before? Really need help.