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Automotive Heating And Air Conditioning Repair
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Qualifying purchases may be interest free if paid in full in 6 months on purchases of $99 or more. There may be other offers.
Interest will be deducted from your account from the date of purchase. If the balance is not paid in full within 6 months, a minimum monthly payment will be required. Subject to credit approval, see Requirements- For PayPal credit, open in a new window or ta15.1 Prepare for the ASE Heating and Air Conditioning Certification Test (A7) “A” (A/C Services, Diagnostics) and repair) description of customs eight step diagnostic procedures for air conditioning systems.
15.3 Explain the method of visual inspection of the air conditioning system. Discuss how to test the performance of the air conditioner. Explain how the cause of problems in the air conditioning system can be identified.
Step 1 Review Customer Complaints (Concerns) Step 2 Perform a thorough visual inspection Step 3 Check Diagnostic Cause Codes (DTC) Step 4 Check Related Technical Service Bulletins (TSB)
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Step 5 Perform an air conditioning performance test Step 6 Find the root cause Step 7 Repair the system Step 8 Check the repair
Understand the exact error The outside air temperature (atmosphere) is above normal, the humidity level is high. The new car is bigger or has more glass space than the customer’s predecessor. A new car that is black or dark in color compared to the previous car in a lighter color, for example white or silver. Light cars reflect light and heat from the sun instead of absorbing it like dark cars.
A visual inspection of the suspension item includes the following: Check the condition of the A/C compressor drive belt Check the tension of the A/C compressor drive belt and the auto tensioner. Inspect coolant hoses and pipes for oil stains and damage.
When inspecting pipes and pipes Check if the system uses a thermal expansion valve (TXV) or an orifice system (OT) and if an adjustable displacement compressor is used. Check that the compressor mounting bolts are tight. Check that the air gap of the air compressor clutch is correct.
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Check the clutch wiring. change blower motor and air conditioner for good, tight and damaged connection See Figure 15-1 Check condition of vacuum hose between intake manifold and septum (if applicable).
10 Figure 15–1 Visually inspect all visible underbody components for possible wear or damage. The components under the instrument panel are checked for noise and proper airflow.
Inspect condenser surface and radiator core to limit air flow due to debris and clean as necessary. with the engine off In-vehicle inspections include: Operate the blower switch through various speeds. listening to the fan and motor for unusual noise
Move the mechanically controlled door temperature lever to both ends of the travel. It should move smoothly and stop before touching the tip. with the engine running Suspension checks include: making sure the compressor clutch is working and the compressor is running. Listen for signs of improper compressor operation.
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Close the A/C clutch to ensure smooth release. When the clutch is released Listen for the correct operation of the clutch bearing. Feel the temperature of the pipes and air ducts. Touch the temperature of the heater pipe. Check engine cooling fan operation (if running) The fan should turn smoothly with good air flow. Check the evaporator vent pipe.
14 Figure 15–2 When the system is working properly The suction hose to the compressor should be cool. and the vent pipe should be hot to very hot The liquid line should also be hot.
Most HVAC-related trouble codes are coded “B”, “C” or “U.” There are P-codes related to the powertrain: P0645 A/C clutch relay control circuit P0646 A/C clutch relay control circuit Low P0647 A/C clutch relay control circuit high
Fan P0691 Fan 1 Control Circuit Low P0692 Fan 1 Fan Control Circuit High P0693 Fan 2 Control Circuit Low Fan P0694 Fan 2 Control Circuit High
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Automakers and the aftermarket issue Technical Service Bulletins (TSBs) to inform technicians of any technical situation or problem. and provide corrective steps and a list of parts needed to resolve the problem. Diagnostic trouble codes should be retrieved before viewing the technical service bulletin boards. This is because many forums include what DTC may or may not be.
18 Figure 15–5 After reviewing the Stored Diagnostic Trouble Codes (DTCs), a smart technician checks the service information for any technical service bulletins. which may relate to the vehicle being serviced
Step 1 Install the pressure gauge in the service port Step 2 Start the engine. set the parking brake and raised the idle cycle to 2000 rpm Step 3 Measure the ambient temperature 3 inches (80 mm) in front of the condenser and measure the humidity.
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Step 4 Place the thermometer in the vent in the center of the air conditioner Step 5 Set the air conditioner to maximum cooling Step 6 Open the door and set the fan speed to high. which uses the maximum load in the system
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22 Figure 15–6 The middle yellow pipe is used to connect the air conditioning system to a vacuum pump or refrigerant canister. When the hose is not in use It should be attached to the gap to seal the system.
Test heat transfer at evaporator and condenser temperature change across the evaporator temperature change across the condenser
If the air conditioning system has a low refrigerant charge The source of the leak should be identified and corrected. electronic dye leak detector in refrigerator
System odor management Organic odors from “dirty socks / gym locker” cause “refrigerator, cement or dust room” odors caused by chemicals.
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Many repairs require proper identification, recovery, evacuation and charging of the refrigerant. after repair The system should work and function as designed. And repairs should be done according to industry recommendations and established car manufacturers.
30 Summary (1 of 3) when diagnosing heating and air conditioning problems. Most automakers recommend following these steps: Step 1 Review customer complaints (concerns) Step 2 Perform a thorough visual inspection.
Step 4 Check the relevant technical service bulletin (TSB) Step 5 Carry out an air conditioning performance test Step 6 Find the root cause Step 7 Repair the system Step 8 Check the repair
32 Summary (3
Heating & Ac Repair: Vehicle Hvac Troubleshooting
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