My air recently quit blowing cold, though blower works fine. After recharging with R134a, pressure seemed fine to mechanic, though compressor wouldn't kick on. My MB indy said it could be a control module which senses engine speed.
Sensor value I get for refrigerant pressure on the A/C readout is OO. Is this from a bad sensor, the fact that the compressor is not running or does it HAVE to be the evarporator?