How do I get my eld to to stop engaging on its own? The switch is pushed in but it still keeps engaging. I have to hold pressure on the switch to keep it off.

First of all, keep in mind that either you go with an expensive e-logging device or a cheap one, it must be approved by FMCSA. If you are looking for affordable eld then I would recommend you BigRoad DashLink that is approved by both DOT and FMCSA. For more, you can also see this https://bestelddevices.com/best-eld-guide/ comparison of the best e-logging devices for truckers. Linxup ELD is also considered a reliable option for fleets.

Did you vacuum the sys and make sure there is no leaks in the system. The compressor will kick in when you get the R134a at the operating level as the pressure sw on the dryer controls that.

Have the codes read. Could be with the TCC solenoid or pressure switch to the TCC keeping the converter partially engaged. If it where fully engage the car would die. Check this soon as it will burn something up in the transmission..IE.. Clutches and more.

Yes, freon must be present in the system in order to circulate the oil that lubricates your compressor. A low pressure switch is used to stop the compressor from running if the freon level/pressure is low. This is to keep your compressor from destroying itself due to lack of lubrication.

There are also several other reasons that an A/C compressor will not engage. Proper diagnosis is required.

The clutch will not engage if it is low on freon. It has a high pressure switch and a low pressure switch which keeps the power from the compressor so no damage will happen. Have the freon checked.

No Blower or just lost A/C function. Just A/C, Look for refrigerant leaks,electronic leak check leaks, scan for a/c related data,put gauges on system and pressure check. All good you got pressure switches and more. Forgot to watch for compressor clutch engagement assuming you have system pressure. That's a start ,will keep you busy for a couple hours. Let us know how you make out.

the neutral switch is to prevent the starter from engaging if not in park or neutral - try just bumping the key switch without holding it - the key lock or ignition switch could be keeping power on starter or the starter solenoid could be keeping the starter engaged someone would have to be under the car listening or touching the starter to see this or measuring voltage on solenoid wire

Generally the A/c Switches are Push On and Push Off type, when you push the switch it should remain on, but it does not, So replace the switch, to confirm the switch is bad, you join the 2 wires come in Switch I mean short them on, your A/C should remain on. It proves that your A/C switch is bad. Thank you. 

the system has a definite leak and should be fixed then the system should be recharged there is a pressure switch that keeps the clutch from engaging when the system is low on freon which keeps from burning up the compressor

check for leaks in the vacuum, Jeep used a vacuum switch for the front axle during that time on the dana 30, it may have a leak or just worn where its not fully engaging and lockign all the way. It may not be holding the air as well to keep it engaged. Its a small tube.