TIGOR EV SERVICE MANUAL

FATC 33 1. 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 cor- rect tension. Yes Go to next step No Adjust or replace drive belt. 2 Inspect refrigerant system performance Perform refrigerant system performance test (Refer AC system performance test) is operating normal? Yes Operation is normal. (Recheck malfunction symptoms) No Go to next step 3 Verify whether malfunction is in blower unit in- take 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 oc- cur, 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 condenser fins. 6 Verify whether malfunction is in expansion valve, receiver/drier and refrigerant lines or elsewhere Are refrigerant’s high-pressure and low-pressure values low? Yes Go to next step No Go to step 14 7 Verify whether malfunction is in expansion valve and receiver /drier or elsewhere immediately after A/C compressor operates, does refriger- ant’s high-pressure value momentarily rise to correct value, then fall and stay below it? (Is there negative pressure on low-pressure side?) Yes Go to next step No Go to step 10.