|
|
1A–52 HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 6. Perform a system leak test: • Charge the system with approximately 200 g (0.44 lbs) of HFC-134a. • Make sure the high pressure valve of the manifold gauge is closed. • Check to ensure that the degree of pressure does not change. • Check for refrigerant leaks by using a HFC-134a leak detector. • If a leak occurs, recover the refrigerant. Repair the leak and start all over again from the first step 7. If no leaks are found, continue charging refrigerant to the air conditioning system. • Charge the refrigerant until the scale reading decreases by the amount of the charge specified. Specified amount: 650g (1.43lbs) • If charging the system becomes difficult: 1 Run the engine at idle and close all the vehicle doors. 2 Turn A/C switch “ON". 3 Set the fan switch to its highest position. 4 Set the air source selector lever to “CIRC". 5 Slowly open the low side valve on the manifold gauge set. WARNING: Be absolutely sure not to open the high 8. When finished with the refrigerant charging, close the low pressure valve of the manifold gauge and 9. Check for refrigerant leaks. Checking The A/C System 1. Run the engine and close all the vehicle doors. 2. Turn A/C switch “ON", set the fan switch to its highest position. 3. Set the air source lever to “CIRC", set the temperature lever to the full cool position. 4. Check the high and low pressure of the manifold gauge. • Immediately after charging refrigerant, both high and low pressures might be slightly high, but they • The ambient temperature should be between 25– 30 ° C (77–86 ° F). • The pressure guideline for the high-pressure side is approximately 1372.9–1863.3 kPa (199.1– • The pressure guideline for the low-pressure side is approximately 147.1–294.2kPa (21.3–42.7 • If an abnormal pressure is found, refer to Checking The Refrigerant System With Manifold 5. Put your hand in front of the air outlet and move the temperature control lever of the control panel to Reading Sight Glass The sight glass provides accurate diagnosis only under • Engine speed idle • A/C switch “ON" • Blower fan operating at highest speed • Air source selector lever at “RECIRC" • Temperature control lever at coldest position • Ambient temperature below 30 ° C (86 ° F) and humidity below 70% (See NOTE 1) • High side pressure less than 1667.1 kPa (241.7 psi) (See NOTE 2) NOTE: 1. If the vehicle cannot be moved to a testing NOTE: 2. If the high side pressure is greater than |