WORKSHEET 4-4 (ON-CAR) HFC-134a Recovery TOYOTA AIR CONDITIONING AND CLIMATE CONTROL Vehicle: Year/Prod. Date: Engine: Transmission: Worksheet Objectives: Given this worksheet, a Toyota vehicle, a Vehicle Repair Manual and a Refrigerant Recovery Machine, you will operate the A/C recovery/recharging machines available at this station. Background: The setup and use of recovery and recycling machines will vary from dealership to dealership. This worksheet emphasizes the importance of proper preparation and equipment safety issues. It is important to understand the operation differences for each machine. Proper care and maintenance of any machine will prevent comebacks and increase customer satisfaction. One person at your dealership should be responsible for maintaining the recycling and recovery equipment. Tools and Equipment: Toyota Vehicle Vehicle Repair Manual Refrigerant Recovery Equipment Safety Glasses Section 1 1. Identify the make and model of the HFC-134a recycling/recovery machine at this station. Brand Model 2. Check the oil level in the vacuum pump assembly. Okay 3. When a new tank is placed into service, a small amount of refrigerant must be added to the new tank. Approximately how much refrigerant should be added before using the new tank? Note: All of the above setup procedures have been performed for you. 4. Drain the oil catch bottle before recovery. Where is the oil catch bottle? TOYOTA Technical Training 4W4-1
Worksheet 4-4 Done Note: Verify that the oil catch bottle is empty. Place it back into its holder before starting. 5. Locate and identify the low-side and high-side A/C system fittings in the vehicle. Connect the appropriate HFC-134a hose fittings to these ports. Done Section 2 Recovery Procedures: Note: Always check the A/C system with a refrigerant identifier test before recovery. Verify there is sufficient refrigerant in the supply tank. 6. Check the sight glass or moisture indicator color on the recovery machine to determine if there is excessive moisture in the system. If the machine has a moisture indicator: Dry Wet (Check one) If wet, notify your instructor to change the filter 7. Check the vacuum pump oil level Okay / Not Okay (Circle one) 8. Engine OFF 9. Locate and record the following information from the A/C label in the engine compartment: a. Charge amount: lb. b. Lubrication type: 10.What is the ambient temperature? F 4W4-2 TOYOTA Technical Training
HFC-134A RECOVERY 11. Connect the high- and low-pressure hoses from the recovery machine onto the vehicle. Note: Verify the fitting valves are closed before connecting to the vehicle A/C system valves. 12. Before starting the recovery process, determine system performance as follows: a. Start engine and warm up to operating temperature. Set the system to maximum cold, then check the temperature at the center vent. What is the temperature of the system? Note: See TIS for Engine Speed and vehicle door opening position. b. Is this temperature an acceptable level of performance? Yes / No (Circle one) c. Observe and record the refrigerant pressures on both gauges. The following illustration shows normal gauge readings. Low-pressure gauge psi (21-35) High-pressure gauge psi TOYOTA Technical Training 4W4-3
Worksheet 4-4 d. Is this vehicle operating normally? Yes / No (Circle one) e. What is your diagnosis of this system at this point?. 13. Follow the directions in the Equipment Operating Manual and recover the refrigerant from this vehicle. Note: Verify the refrigerant valves on the recovery machine are closed. Do not disturb the recovery machine or the refrigerant supply tank during the recovery/recycling/recharging operation as this could upset the charge amount. Done 14. How much refrigerant did you recover?. 15. How does this compare with the amount on the label?. 16. How much oil was removed during refrigerant recovery?. What type and how much oil do you need to put back in the system?. Under what conditions do you add oil to the system during this procedure?. 17. Remove moisture from the system with a vacuum pump. Evacuate at 29.5 in. Hg for approximately 5 minutes (See note). Done Note: If the system does not hold a vacuum there is a leak in the system. This evacuation process is important. It normally takes 30-60 minutes to complete. 18. Does the system hold a vacuum after 5 minutes? Yes / No (Circle one) 19. Follow the instructions for recharging and begin that process. Install the specified amount of refrigerant into the system as you removed. Refer to the vehicle label or the Vehicle Repair Manual for the proper amount. How much refrigerant are you going to charge?. 4W4-4 TOYOTA Technical Training
HFC-134A RECOVERY 20. Do the A/C Pressure Gauges display approximately the same amount when you started? Done 21. Return the workstation to its original condition. Instructor Sign Off: TOYOTA Technical Training 4W4-5
Worksheet 4-4 HFC-134a Recovery Name: Date: Check each category after participating in the classroom discussion and complete this sheet as you are completing Worksheet 4-4 using the HFC-134a Recovery worksheet in the shop. Ask the instructor if you have any questions regarding the topics provided below: I have questions I know I can Topic Comment Importance of Refrigerant Recovery Identification of parts of recovery station Location of vacuum pump and oil level Low- and high-pressure hoses and control valves Location and use of oil drain bottle and replenishment of oil Recovery process from vehicle Evacuation process Recharging refrigerant to vehicle Recovering charge station hoses after use 4W4-6 TOYOTA Technical Training
HFC-134A RECOVERY Notes TOYOTA Technical Training 4W4-7