TIAGO TIGOR CNG - SERVICE MANUAL

HVAC 20 AIR FROM VENTS NOT COLD ENOUGH TROUBLESHOOTING HINTS  Drive belt malfunction: Step 1  Malfunction in blower unit or condenser: Step 4, 5  Malfunction in receiver / drier, expansion valve ( valve close too much) or expansion valve heat-sensing tube installed incorrectly: Step 8, 9  Malfunction in refrigerant lines: Step 10- 13  A/C compressor system malfunction, insufficient compressor oil: Step 16  Too much compressor oil, expansion valve heat-sensing tube installed incorrectly, or malfunction in expan- sion valve or heater unit’s air mix link system: Step 18- 19 TROUBLE SHOOTING STEP INSPECTION ACTION 1 Inspect drive belt See whether the belt is present or fitted with correct tension. Yes Go to next step No Adjust or replace drive belt. 2 Inspect refrigerant system perfor- mance Perform refrigerant system perfor- mance test (Refer AC system performance test) is operating normal? Yes Operation is normal. (Recheck malfunction symp- toms) No Go to next step 3 Verify whether malfunction is in blower unit intake and condenser or another Are refrigerant’s high-pressure and low pressure values both high? Yes Go to next step. No Go to step 6. 4 Inspect blower unit intake is blower unit intake clogged Yes Remove obstruction. (If air does not reach evaporator within cooling unit, heat exchange does not occur, refrigerant pressure becomes high, and therefore, removal of obstruction is necessary.) No Go to next step 5 Inspect condenser is it okay? Yes Adjust refrigerant to specified amount. (Excessive amount of refrigerant.) No Replace condenser, or repair and clean conden- ser fins. 6 Verify whether malfunction is in expansion valve, receiver/drier and refrigerant lines Yes Go to next step