ALTROZ SERVICE MANUAL

HVAC (ETC) 18 14. TROUBLESHOOTING A.C .CHECK POINT SR. NO. CHECK POINTS NORMAL CONDITION RESULTS A PASSENGER CABIN Fresh / recirculation actua- tor position. Should be in recirculation mode. Will stop entry of hot air from outside. Air direction button position. Should be in face mode. Will ensure proper cooling Temperature control actua- tor position. Should be in maximum cool position. Will ensure that heater is not working with A.C ON. Grill direction Centre grill towards rear seats. Will ensure proper distribution of air in the vehicle. Side grill towards passenger & driver seat B ENGINE ROOM Condenser surface Should be clean and dust / dirt free. Will ensure total liquidification of re- frigerant. Engine coolant level Should be on maximum level Will prevent engine from overheating. Engine tuning Should be as per specifica- tions. Will prevent engine room overheating and increase in fuel consumption. Belt tension Belt should not be too loose or too tight. Loose belt will slip and affect AC per- formance TROUBLE SHOOTING SR. NO. COMPLAINT POSSIBLE CAUSE REMEDY 1 Insufficient flow of cold air 1. Evaporator clogged or frosted. 2. Air leaking from cooling unit or air duct. 3. Air inlet blocked. 4. Blower motor faulty. 5. Filter clogged. 6. Condenser clogged. 7. Compressor Faulty. 1. Check evaporator. 2. Repair as necessary. 3. Repair as necessary. 4. Replace blower motor. 5. Replace Filter. 6. Repair or Replace condenser. 7. Repair or Replace compressor. 2 Blower won't work even when its switch is ON 1. Blower fuse blown. 2. Blower motor faulty. 3. Wiring or grounding faulty. 4. LPM Faulty. 1. Replace fuse. 2. Replace motor. 3. Repair as necessary. 4. Replace LPM. 3 Incorrect tem- perature output 1. Air ducts clogged. 2. Heater matrix leaking or choked. 3. Heater hoses leaking or choked. 4. Kinematics jammed.  Repair air ducts.  Replace heater matrix.  Replace hoses.  Repair/Replace kinematics. 4 Cold air comes out only inter- mittently 1. Magnetic clutch slipping. 2. AC relay faulty. 3. Expansion valve faulty. 4. Wiring connection faulty. 5. Excessive moisture in the system. 1. Check magnetic clutch. 2. Replace faulty relay. 3. Check expansion valve. 4. Repair as necessary. 5. Evacuate and charge AC system.