Quote:
Originally Posted by rwdkev
Dave,
On cars with fuel injection, ECU takes signal from A/C control unit (and in some cases also compressor clutch feed) and uses this to adjust Idle Air Control (IAC) valve.
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yes , The Engine ECU actually controls the AC . The command comes in to it from the climate unit to request cooling , if conditions are right the engine ECU will activate the AC clutch , ambient and engine temperature and engine RPM , AC Pressure are a few of the factors which enable the request to be allowed to pull the clutch in . So if the AC does not turn on when you press the button there are a lot of checks needed to find out why .