Ether the AC compressor bearings or the alternator bearings. One of the things running off the belts is locking up. It will stall an engine. Start it and run it for just a little while and feel for something that is real hot. Also check to see what belt is now loose. That can point you in the right direction.
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Weird thing is when I start it in the morning (before any of this happened) no belt squeak, but when I would start it in the evening after work the belts would squeal...every day, both belts are tight and are new Napa units, a/c bearing is new as well.Originally Posted by camoit
Also today on the way to the parts store after work it did it again with the a/c on, (stumbled, engine light came on and wouldn't idle) so I turned it off, restarted car, light went off and car idled fine again. I then continued my trip with the a/c on only at speed, when I slowed or got near idle speed I turned a/c off....idle didn't slow nor engine light lit. So Alternator bearings maybe or idle up solenoid (does it have one?)
Pretty sure a 4 cylinder engine has to have an idle up since the AC unit strains the engine so much. My MR2 is doing that low idle thing occasionally with AC on. It is acting just like yours without any belt squealing. I'm pretty sure the throttle positioner or idle up is going bad. Yours could have bearing issues that is restricting the belt from free spinning at a normal rate. Make sure you picked up the correct belt also. It should fit in the groove correctly with full contact of the pulley and not be riding up high on the groove.
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