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?

this morning??? Maybe reading the a/c diag code wil help point you in the right direction.

If the a/c system took a charge AND CAN HOLD IT, then look into the pressure switch located on the receiver/dryer. It's that switch that lets the compressor start if it senses enough pressure in the system. It does fail and that's what happens. I'd check there first.

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Regards . . . . JimF
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'94 S500 Cpe

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Thanks. It appears we're narrowing it down, because the system is definitely pressurized, I checked, which means evaporator is okay (whew!). Hopefully it is just this switch. I'll keep forum posted.