PRAKTEK SMK TES TEKANAN, PENGOSONGAN, PEMVAKUMAN, MENAMBAH OLI, ISI FREON, CEK KEBOCORAN AC MOBIL

Introduction

This tutorial is designed to guide automotive students, particularly those in vocational high schools specializing in automotive technology, through the essential processes of inspecting and repairing a car's air conditioning (AC) system. The steps outlined are based on practical techniques demonstrated in the video, focusing on pressure testing, vacuuming, adding oil, refilling refrigerant, and checking for leaks.

Step 1: Pressure Testing the AC System

• Gather Necessary Tools: Ensure you have a pressure gauge, hoses, and safety gear.
• Connect Pressure Gauge: Attach the pressure gauge to the low-pressure service port of the AC system.

Read Pressure Levels: Start the engine and turn on the AC. Note the pressure readings

• Normal operating pressure is typically between 25-45 psi.
• A reading outside this range may indicate a problem.
• Document Findings: Keep a record of the pressure levels for future reference.

Step 2: Vacuuming the AC System

• Use a Vacuum Pump: Connect a vacuum pump to the service ports.
• Evacuate the System: Turn on the vacuum pump for about 30 minutes. This process removes moisture and air from the system.
• Check for Leaks: After vacuuming, turn off the pump and observe the pressure gauge. A stable reading indicates no leaks; a drop in pressure suggests a leak.

Step 3: Adding Oil to the AC System

• Identify Oil Type: Determine the correct type of refrigerant oil required for your AC system (often PAG oil).
• Connect Oil Injector: Attach an oil injector to the low-pressure port.
• Add Oil: Inject the appropriate amount of oil (usually specified in the vehicle’s service manual).
• Check for Proper Distribution: Ensure that oil circulates well within the system.

Step 4: Refilling Refrigerant

• Get the Right Refrigerant: Ensure you have the correct type of refrigerant (such as R134A).
• Connect Refrigerant Canister: Attach the refrigerant canister to the low-pressure service port.
• Fill the System: Slowly open the canister valve and allow the refrigerant to enter the system while monitoring the pressure gauge.
• Achieve Proper Levels: Aim for the recommended refrigerant level, usually indicated in the vehicle's manual.

Step 5: Checking for Leaks

• Use a Leak Detector: Utilize an electronic leak detector or soap solution to check connections and joints.
• Inspect Visually: Look for any signs of oil or refrigerant leakage around fittings and hoses.
• Confirm System Integrity: Ensure that no leaks are present before finalizing repairs.

Conclusion

In this tutorial, we've covered the essential steps for inspecting and repairing a car's AC system, including pressure testing, vacuuming, adding oil, refilling refrigerant, and checking for leaks. These skills are fundamental for automotive students and professionals alike. As a next step, practice these techniques on actual vehicles to gain hands-on experience, ensuring safety protocols are followed throughout the process.