For 1990-2009 cars

Checks | Actions
--- | ---
A loss of coolant | Add coolant.
A weak coolant solution | Confirm that the coolant solution is a 50/50 mixture of ethylene glycol and water.
Any dirt, any leaves, or any insects in front of the radiator | Clean the front of the radiator.
Leakage from the following components:

• | The hoses

• | The coolant pump

• | The heater

• | The thermostat housing

• | The radiator

• | The core plugs

• | The head gasket

Replace any damaged components.

A faulty thermostat | Replace a damaged thermostat.
Retarded ignition timing | Perform an ECM code diagnosis. Confirm the integrity of the timing belt.
An improperly operating electric cooling fan | Replace the electric cooling fan.
Plugged or rotted radiator hoses | Replace any damaged radiator hoses.
A faulty water pump | Replace a faulty water pump.
A faulty surge tank cap | Replace a faulty surge tank cap.
A cracked or plugged cylinder head or engine block | Repair the damaged cylinder head or the damaged engine block.