AC Compressor Not Getting Power? Troubleshooting.

Hello,

Currently, I'm experiencing a small issue with an Iveco Euro Cursor Trakker, a 4-axle truck.
"The air conditioning system isn't working. I checked the compressor and saw that the magnetic clutch isn't engaging. I then disconnected the cable and powered the clutch with my testing device, and it worked perfectly. So, it seems there's no power reaching it. I suspect a broken wire.

Question: If there was no refrigerant in the system, would the pressure switch completely shut off the power to the magnetic clutch (making the compressor inoperable)? Or would it still briefly turn on and off when I turn the knob to "AC"? I hope I've explained the situation adequately.

Regards,
Luiggi"

Quote:

Question: If there is no more liquid in the system, the pressure switch of the system will completely turn off the magnetic coupling.

Okay! If there's too little refrigerant in the system, it will shut down for safety. It's likely that the system has a leak. Use a climate control service device to extract the remaining refrigerant, evacuate the system, refill the system with the correct amount of refrigerant according to the manufacturer's specifications, and add a leak detection dye. This will allow you to later locate the leak using a UV lamp.

Hello T3 Surfers,

Yesterday, I briefly bypassed the pressure switch on the dryer again, and the compressor started up as a result. You are absolutely right. There is a leak somewhere in the system, which is causing a lack of refrigerant.
I'll have the system checked by a climate service technician on Tuesday. So, there are no missing connections in the system's wiring. Thank you again for your help.

Hi.

"However, do not inject any contrast agent, but instead use a mixture of nitrogen and refrigerant to pressurize the system. The contrast agent can alter the viscosity of the compressor oil and cause the service ports to become clogged."

I'm posting based on my experience, as I work with climate control/refrigeration systems every day.

Best regards, Rüdi.