When starting up, engine cold, if I put the AC on, it emits a loud an annoying moan (that increases and decreases in pitch as engine speed increases and decreases). Once the engine is warm, the moan goes away, mostly.<p>Anyone have this? What is it?
Is your A/C working normally other than the moan?<p>Can you get the same moan if you put additional accessory load on engine? Turn on high beams, seat heaters, defoggers, or other high consumers to see if there is a moan. Could be an indication of serpentine belt and/or idler failure.<p>If the A/C has periods when it does not blow cold, it could be that the compressor clutch is failing, and not engaging each time there is demand for it, and it will moan/screech. Clutch can be re-shimmed if yhou can find a tech who knows what he/she is doing.