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Cooling System Diagnosis

WARNING: This page is about a different car, the 2005 Suzuki Reno and 2005 Suzuki Forenza. However, it is still accessible from the selected car via links, so may be relevant.

Engine Overheats 

DIAGNOSIS PROCEDURE - COOLING SYSTEM

Checks Action
Check for a loss of the coolant. Add the coolant.
Check for a weak coolant solution. Confirm that the coolant solution is a 50/50 mixture of ethylene glycol and water.
Check the front of the radiator for any dirt, any leaves, or any insects. Clean the front of the radiator.
Check for leakage from the hoses, the coolant pump, the heater, the thermostat housing, the radiator, the core plugs, or the head gasket. Replace any damaged components.
Check for a faulty thermostat. Replace a damaged thermostat.
Check for retarded ignition timing. Perform an ECM code diagnosis. Confirm the integrity of the timing belt.
Check for an improperly operating electric cooling fan. Replace the electric cooling fan.
Check for radiator hoses that are plugged or rotted. Replace any damaged radiator hoses.
Check for a faulty water pump. Replace a faulty water pump.
Check for a faulty surge tank cap. Replace a faulty surge tank cap.
Check for a cylinder head or an engine block that is cracked or plugged. Repair the damaged cylinder head or the damaged engine block.

Loss of Coolant 

COOLANT DIAGNOSIS SPECIFICATIONS

Checks Action
Check for a leak in the radiator. Replace a damaged radiator.
Check for a leak in the following locations:
  • Surge tank.
  • Hose.
 Replace the following parts, as needed:
  • Surge tank.
  • Hose.
Check for loose or damaged radiator hoses, heater hoses, and connections. Reseat the hoses.
Replace the hoses or the clamps.
Check for leaks in the coolant pump seal. Replace the coolant pump seal.
Check for leaks in the coolant pump gasket. Replace the coolant pump gasket.
Check for an improper cylinder head torque. Tighten the cylinder head bolts to specifications.
Replace the cylinder head gasket, if needed.
Check for leaks in the following locations:
  • Intake manifold.
  • Cylinder head gasket.
  • Cylinder block plug.
  • Heater core.
  • Radiator drain plug.
 Repair or replace any components, as needed, to correct the leak.

Engine Fails to Reach Normal Operating Temperature or Cool Air from the Heater 

ENGINE FAILS DIAGNOSIS CHART

Checks Action
Check to determine if the thermostat is stuck open or is the wrong type of thermostat. Install a new thermostat of the correct type and heat range.
Check the coolant level to determine if it is below the MIN mark on the surge tank. Add sufficient coolant to raise the fluid to the specified mark on the surge tank.
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