1990 Acura Legend Overheating when the AC is put on.

My car is in good working condition until I notice that when am stocked for over three hours on traffic, the car wouldnt start after its been put off, except it stays for about 1hr. The second time I had to hit the kickstarter before it start. So I decided to service the kick starter and alternator becos the alter fails sometime (showing battery light on). Just after the servicing, my car started over heating when am using the ac. Without the AC, the gauge is fine at the center. If the AC comes on, within 2 minutes the temperature gauge moves close to the H. But if I turn off the AC, it gradually comes back to the center while still on motion. What should I do to use my AC constantly like before I service the ALternator and Kick starter.
Meanwhile, while looking at the position of the kick starter, I discover that the technician broked one engine part that is red in color protruding out from the engine block alittle above the kickstarter (maybe in the process of trying to loose and fix the kickstarter). I asked him, he said it doesnt have anything to do with the over heating.
Pls I need a help.