Symptoms
|
Possible Causes
|
Remedy
|
Coolant leakage
|
| • |
From the bleed hole of the water pump
|
|
Visually check
|
| • |
Check leaks after about ten-minute warming up.
|
|
| • |
If coolant still leaks, replace a water pump.
|
|
| • |
If leakage stops, reuse the water pump (Do not replace the pump
with a new one).
|
|
| • |
From gaskets or bolts
|
|
| • |
Check the tightening of the water pump mounting bolts.
|
|
| • |
Retighten the mounting bolts.
|
|
| • |
Check damage of gaskets or inflow of dust.
|
|
| • |
Replace the gasket and clean dust off.
|
|
| • |
From outer surface of water pump
|
|
| • |
Check the material or any cracks of the water pump.
|
|
| • |
Poor material. If any crack found, replace the water pump.
|
|
Noise
|
| • |
From mechanical seals
|
| • |
Impeller interference
|
|
Inspection with a stethoscope
|
| • |
After starting the engine, check noise with a stethoscope.
|
|
| • |
If there is no noise, reuse the water pump(do not replace it).
|
|
| • |
If there is any noise from the water pump, remove the drive
belt and recheck.
|
|
Inspection after removing a drive belt
|
| • |
After removing a water pump and a drive belt, check noise again.
|
|
| • |
If there is noise, reuse the water pump. Check other drive line
parts.
|
|
| • |
If there is no noise, replace the water pump with a new one.
|
|
Inspection after removing a water pump
|
| • |
After removing a water pump and a drive belt, check noise again.
|
|
| • |
If there is any interference between them, replace the water
pump with a new one.
|
|
Overheating
|
|
Loosened impeller
|
| • |
Corrosion of the impeller wing
|
|
| • |
Check engine coolant.
|
| • |
Poor coolant quality / Maintenance check
|
|
| • |
Impeller seperation from the shaft
|
|
| • |
Replace the water pump.
|
|
Other information:
Refrigerant System Service
Basics (R-134a)
Refrigerant Recovery
Use only service equipment that is U.L-listed and is certified to meet the requirements
of SAE J2210 to remove HFC-134a(R-134a) from the air conditioning system.
Description
The In-car air temperature sensor is built in the heater & A/C control unit.
The sensor contains a thermistor which measures the temperature of the inside.
The signal decided by the resistance value which changes in accordance with
perceived inside temperature, is delivered to heater control unit and accord
