3.1. Checking the air conditioning system elements
Check the air conditioning system components for mechanical damage, replace damaged components (visual inspection).
3.2. Checking the condition of the auxiliary equipment drive belt
Check the condition of belt 2, Figure 3-1, of the auxiliary equipment drive. The presence of cracks, fraying and delamination of the belt is not allowed. If necessary, replace the accessory drive belt:
- turn the automatic tension roller 3, Figure 3-1, of the accessory drive belt clockwise (spanner 16);
- lock roller 3 tensioner with hex key (allen key 6 mm);
- remove belt 2 of auxiliary equipment drive;
- remove tension roller 3 and idler roller 4 (replaceable heads 10 and 13, ratchet, extension);
- install new tension and idler pulleys (replaceable heads 10 and 13, ratchet, extension);
- turn automatic tension roller 3 (spanner 16);
- lock roller 3 tensioner with hex key (allen key 6 mm);
- install new accessory drive belt 2;
- unlock tension roller 3.
Attention: The removed accessory drive belt must be replaced.
Caution: When replacing the accessory drive belt, be sure to replace the tensioner and idler pulleys.
Figure 3-1 - Checking the accessory drive belt: - crankshaft pulley; 2 - auxiliary equipment drive belt; 3 - tension roller; 4 - idler roller; 5 - compressor pulley
3.3. Checking the engagement of the compressor electromagnetic clutch
Start the engine and warm it up to operating temperature, turn on the heater fan motor and the air conditioner switch.
If necessary, correct the fault (see the section "Diagnostics of the vehicle air conditioning system").
3.4. Checking the amount and condition of the refrigerant in the air conditioning system
Check the amount and condition of the refrigerant in the air conditioning system:
- connect the service hoses to the fittings on the air conditioning system pipes and open the valves on the hose ends;
- start and warm up the engine to operating temperature;
- set the air recirculation mode to the outside air intake position;
- turn on the heater fan motor and set it to maximum speed;
- open the central and side ventilation nozzles on the panel and set them to neutral position;
- set the air conditioner switch to the "on" position and turn the temperature control to the "MIN" position;
- close all windows and doors of the car;
- ensure constant operation of the engine cooling system fan;
- set the engine crankshaft speed to 2000 rpm;
- measure the ambient air temperature (TA), figure 3-2, after the values have stabilized;
Figure 3-2 - Measuring ambient air temperature
- wait 5 minutes and measure the air temperature from the left side ventilation nozzle (T1), Figure 3-3, and the right side ventilation nozzle (T2);
Figure 3-3 - Measuring the temperature of the cooled air
- after stabilizing the values, determine the temperature difference between T3 and the largest of the values T1 or T2;
- determine the difference in values between T1 and T2.
If the temperature difference between T1 and T2 is greater than 2°C or the temperature difference between T3 and the largest of the values of T1 or T2 is less than 5°C, then the system is faulty and it is necessary to diagnose the air conditioning system according to the section "Diagnostics of the air conditioning system of the LADA LARGUS car".