AC Idle Solenoids

by George Nenadovich

Here is a 72-up AC idle solenoid. This item raises the idle rpm when the ac compressor is on. Due to the additional load place on the engine, the idle needs to be increased to maintain non-AC idle speeds. The idle rpm/speed with the compressor on is set with the plunger, use a 3/8" wrench to unscrew the plunger to increase the idle speed.


This is the late 71 AC idle solenoid. Notice the different bracket configuration. It has one screw that hold it to the intake manifold while the 72-up versions use 2 screws.


Here is a side-by-side comparison of the two solenoids.


Another pic showing the differences of the mounting brackets.