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HVAC
843
HVAC
TROUBLESHOOTING CHART (A)
TROUBLE
POSSIBLE CAUSE
REMEDY
Insufficient flow of cold air
1. Evaporator clogged or frosted 1. Check evaporator
2. Air leaking from cooling unit or
2. Repair as necessary
air duct
3. Air inlet blocked
3. Repair as necessary
4. Blower motor faulty
4. Replace blower motor
Blower wont work even
1. Blower fuse blown
1. Replace fuse.
when its switch is ON
2. Blower motor faulty
2. Replace motor
3. Wiring or grounding faulty
3. Repair as necessary
Incorrect temperature output
1. Control cables broken or binding 1. Check cables
2. Control cables not connected 2. Connect cables properly
properly
3. Air ducts clogged
3. Repair air ducts
4. Heater core leaking or choked 4. Replace heater matrix
5. Heater hoses leaking or choked 5. Replace hoses
6. Kinematics jammed
6. Repair/Replace kinematics
Cold air comes out only
1. Magnetic clutch slipping
1. Check magnetic clutch
intermittently
2. AC relay faulty
2. Replace faulty relay
3. Expansion valve faulty
3. Check expansion valve
4. Wiring connection faulty
4. Repair as necessary
5. Excessive moisture in the
5. Evacuate and charge AC system
system
6. Faulty thermistor cutin and/or
6. Replace thermistor
cutoff setting