I accomplished this task by reading the AC system chapters in the HVAC book. I also learned a lot about these refrigerant types and oil types thru a lot of classroom discussion. I also learned about how to research vehicle information and fluid type specifications back at the Copper Country ISD on AllData. I put my knowledge to work by performing all sorts of refrigerant and A/C related tests and tasks on the Jeep Grand Cherokee in the shop.
A3. Performance test A/C system; identify problems.
I accomplished this task by reading the A/C system diagnosis chapter i the HVAC book. I did this test on the Jeep Grand Cherokee in the shop using a Gauge manifold. The low side and high side pressures should be relatively the same if the vehicle is not running, and it should be pretty close to the number of ambient temperature degrees. When the car is running however, the high side pressure should be close to 130 psi and the sow side should be at about 30 psi.
A5. Identify refrigerant type; select and connect proper gauge set/test equipment; record
temperature and pressure readings.
I accomplished this task by using the refrigerant purity tester to figure out what kind of refrigerant the Jeep Grand Cherokee used. When I learned that the refrigerant type was R134A, I used the gauge manifold to test the pressure readings of the low side and the high side. they where stable, so I tested the temperature of the air coming out of the vents. I used a little thermometer to accomplish this.
A6. Leak test A/C system; determine needed action.
I accomplished this task by reading the AC system diagnosis chapter in the HVAC book. I also learned how to do this leak test by completing the Argo modules that had to do with the leak sniffers and uv light dye detector. I actually did this task hands on on the Jeep Grand Cherokee in the shop. I used the leak sniffer, and when it did not bring up any sniff able leaks, I used the Dye detecting UV flash light. I did did up finding some minuscule leaks around the compressor.
A7. Inspect condition of refrigerant oil removed from A/C system; determine needed action. P-2
I accomplished this task by reading the AC system diagnosis chapter in the HVAC book. I did this task hands on, on the Jeep Grand Cherokee, when I removed the AC compressor and drained the compressor oil. I drained the oil into a little measuring cup in which i could see the visual condition of the fluid, as well as the quantity of the fluid. If the fluid was dirty, I would have replaced the compressor oil. Either way, I would put new compressor oil i the compressor because it is not right to reuse the oil.
A8. Determine recommended oil and oil capacity for system application.
I accomplished this task by reading the AC system diagnosis chapter in the HVAC book. I also checked the oil capacity of the Jeep Grand Cherokee on AllData. Then, I removed the AC compressor and drained the oil into a little measuring cup, and I compared the amount of oil to specs. It was a little low.
B1. Inspect, remove, and/or replace A/C compressor drive belts, pulleys, tensioners and visually
inspect A/C components for signs of leaks; determine needed action.
I accomplished this task by reading the AC system diagnosis chapter in the HVAC chapter. I also accomplished this chapter by completing the AC compressor Argo modules, along with the drive belt modules on Argo. I also did this task hands on while removing the AC compressor out of the Jeep Grand Cherokee in the shop. I had to remove the drive belt and inspect the pulleys.
B2. Inspect, test, service and/or replace A/C compressor clutch components and/or assembly;
check compressor clutch air gap; adjust as needed.
I accomplished this task by reading the AC compressor diagnosis chapter in the HVAC book. I did this task hands on on the bench with a compressor that was taken out of a 1996 Ford. I took the compressor coil off of the compressor, along with the pulley and other components. I measured the air gap using a feeler gauge. It was correct according to All Data.
B3. Remove, inspect, reinstall, and/or replace A/C compressor and mountings; determine
recommended oil type and quantity
I accomplished this task by removing the air conditioning compressor from the 1998 Jeep Cherokee in the shop. I further accomplished this task when I re installed the compressor. I determined the correct oil type and quantity by looking them up on All Data, and the little placard that specified the system capacity, and oil type. The refrigerant type was R134A, and the oil type was PAG 46 oil.
D2. Diagnose A/C compressor clutch control systems; determine needed action. P-2
I accomplished this task by reading the compressor chapter in the HVAC book. I also studied a few wiring diagrams online of compressor clutch circuits. I also used Argo to get more acquainted with compressor clutch control systems. I also got pretty close to the compressor clutches when we took the compressor clutches and coils off of the compressor that came off of the 1996 Ford. I would determine necessary actions based on the noises, voltage drops, and general system operations of the AC system.
E1. Perform correct use and maintenance of refrigerant handling equipment according to
equipment manufacturer’s standards.
I accomplished this task by paying attention in class when Jerry was taking about how the refrigerant recovery machines worked and how to properly use them. I also read the service manuals for both the new and old machines that we have in the shop. I accomplished this task by repeatedly recovering, vacuuming, and recharging various systems in the shop. I did this task on the Jeep Grand Cherokee, the Bonneville.
E2. Identify A/C system refrigerant; test for sealants; recover, evacuate, and charge A/C system;
add refrigerant oil as required.
I accomplished this task when me and Kevin Semmens used the sealant tester on the Pontiac Bonneville in the shop. We read the users manual for that tester, and we put it together and tested that there was no sealant in the system. I also did some research on youtube.
E3. Recycle, label, and store refrigerant.
I accomplished this task by reading the AC refrigerants chapter in the HVAC book. I learned about the proper ways to recover used refrigerant pout of a car's AC system. I have done a lot of system recovery and vacuum and recharging in my timer at the HVAC class. I have used both the old and new machines to correctly recycle, store and label refrigerant as R134A.
