WHAT IS THIS PARTS CALL ?
looks like a solenoid, possibly mal-adjusted, as RPMs are supposed to increase to compensate for the load of the A/C.
This is an idle speed up solenoid. If I'm looking at the photo correctly you're missing a vacuum hose. I believe the way it works is when you switch on the air conditioning that solenoid is energized. Then vacuum is fed to the distributor to advance ignition timing and increase your idle speed to compensate for the added load of the A/C compressor. With a missing vacuum hose each time the solenoid opens you're creating a vacuum leak. That's probably why your idle speed drops instead of increasing. HTH. -Jim
Yeap, one of the hose are broken at the connecting part. Thanks!
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