I belive that you are refering to the IAC Valve (Idle Air Control). It controls the engine idle speed. It is located on the throttle body and mounted with 2 star type screws.The wire connector looks square and is black in color. It has 4 wires on the plug. You can find out more and how to test it at autozone.com. Click repair info, then click repair manuals.
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Where_is_the_EGR_valve_on_a_98_Cavalier
A 2000 Chrysler 300m does not have a heater valve. The cabin temperature is controlled by airflow doors.
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above the throle body