Thermostat check
1. Remove the thermostat from the car. follow the paragraph «Thermostat» in this section.
2. Make sure the valve springs are compressed when the thermostat is fully closed. If the spring is not compressed, replace the thermostat.
3. Hang the thermostat and thermometer in a pan filled with a 50/50 mixture of ethylene glycol and water. Do not allow the thermostat and thermometer to be at the bottom of the tray, because uneven heat concentration at the bottom may affect the correct temperature measurement.
4. Heat up the pan with a burner.
5. Use a thermometer to measure the temperature of the heated solution.
6. The thermostat should start opening at 87°C (189°F) and should be fully open at 102°C (216°F). If the thermostat does not open at these temperatures, replace the thermostat.
Engine overheating
|
Checkpoints
|
operation, action
|
|
Check for coolant leakage.
|
Add coolant.
|
|
Check the concentration of the coolant solution.
|
The coolant solution should be a 50/50 mixture of ethylene glycol and water.
|
|
Check the front of the radiator for dirt, leaves or insects.
|
Clean the front of the radiator.
|
|
Check for leaks from hoses, water pump, heater, thermostat housing, radiator, rod plugs, or cylinder head gasket.
|
Replace damaged components.
|
|
Check the thermostat.
|
Replace damaged thermostat.
|
|
Check ignition delay.
|
Diagnose the ECM code. Check the safety of the timing belt.
|
|
Check the operation of the cooling fan.
|
Replace the cooling fan.
|
|
Check the radiator hoses for clogging or wear.
|
Replace damaged radiator hoses.
|
|
Check the operation of the coolant pump.
|
Replace faulty coolant pump.
|
|
Check the expansion tank cap.
|
Replace the defective expansion tank cap.
|
|
Check the cylinder head or cylinder block for damage or blockage.
|
Repair damaged cylinder head or damaged cylinder block.
|
Coolant leak
|
Checkpoints
|
operation, action
|
|
Check radiator for leaks.
|
Replace damaged radiator.
|
|
Check for leaks in the following locations:
|
Replace the following parts as needed.
|
|
Check for loose or damaged radiator hoses, heater hoses and connectors.
|
Attach the hoses correctly.
Replace hoses or hose clamps.
|
|
Check the coolant pump seal for leaks.
|
Replace the water pump seal.
|
|
Check the water pump gasket for leaks.
|
Replace the water pump gasket.
|
|
Check the tightness of the cylinder head.
|
Tighten the cylinder head screws to the specified values.
Replace the cylinder head gasket if necessary.
|
|
Check for leaks in the following locations:
|
Repair or replace leak components as needed.
|
Engine not reaching normal operating temperature or cold air from heater
|
Checkpoints
|
operation, action
|
|
Check if the thermostat is stuck open or if the thermostat is the wrong type.
|
Install the correct thermostat type and heating range.
|
|
Check if the coolant level reaches the MIN·mark on the expansion tank.
|
Add coolant up to the indicated mark on the expansion tank.
|