Before you unplug and remove the solenoid be aware that oil will come out with it and land right on top of the drive wheel and belt! You can cover this whole area with shop cothes! I did not do this and had to use brake cleaner to get rid of the oil!

The first photo shows the Solenoid being removed from the engine. You can use a flat-blade screwdriver to get it started, then pull it all the way out and let it drop so you can unplug it. To unplug the solenoid, squeeze the Tab on the plug. I used Long-Nose Locking Pliers to depress the Tab and hold the plug while pulling off the solenoid.

The last photograph shows the bad Solenoid on the bottom covered in rust, and you can see that the back by the connector is heavily corroded. Rust probably formed on the Armature, causing the Solenoid to stick open or closed. Above is the replacement used OEM part. The car it came from was not from the rust belt and is in perfect condition.